1/*
   2 * vt8231.c - Part of lm_sensors, Linux kernel modules
   3 *	      for hardware monitoring
   4 *
   5 * Copyright (c) 2005 Roger Lucas <vt8231@hiddenengine.co.uk>
   6 * Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
   7 *		      Aaron M. Marsh <amarsh@sdf.lonestar.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/*
  25 * Supports VIA VT8231 South Bridge embedded sensors
  26 */
  27
  28#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  29
  30#include <linux/module.h>
  31#include <linux/init.h>
  32#include <linux/slab.h>
  33#include <linux/pci.h>
  34#include <linux/jiffies.h>
  35#include <linux/platform_device.h>
  36#include <linux/hwmon.h>
  37#include <linux/hwmon-sysfs.h>
  38#include <linux/hwmon-vid.h>
  39#include <linux/err.h>
  40#include <linux/mutex.h>
  41#include <linux/acpi.h>
  42#include <linux/io.h>
  43
  44static int force_addr;
  45module_param(force_addr, int, 0);
  46MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");
  47
  48static struct platform_device *pdev;
  49
  50#define VT8231_EXTENT 0x80
  51#define VT8231_BASE_REG 0x70
  52#define VT8231_ENABLE_REG 0x74
  53
  54/*
  55 * The VT8231 registers
  56 *
  57 * The reset value for the input channel configuration is used (Reg 0x4A=0x07)
  58 * which sets the selected inputs marked with '*' below if multiple options are
  59 * possible:
  60 *
  61 *		    Voltage Mode	  Temperature Mode
  62 *	Sensor	      Linux Id	      Linux Id	      VIA Id
  63 *	--------      --------	      --------	      ------
  64 *	CPU Diode	N/A		temp1		0
  65 *	UIC1		in0		temp2 *		1
  66 *	UIC2		in1 *		temp3		2
  67 *	UIC3		in2 *		temp4		3
  68 *	UIC4		in3 *		temp5		4
  69 *	UIC5		in4 *		temp6		5
  70 *	3.3V		in5		N/A
  71 *
  72 * Note that the BIOS may set the configuration register to a different value
  73 * to match the motherboard configuration.
  74 */
  75
  76/* fans numbered 0-1 */
  77#define VT8231_REG_FAN_MIN(nr)	(0x3b + (nr))
  78#define VT8231_REG_FAN(nr)	(0x29 + (nr))
  79
  80/* Voltage inputs numbered 0-5 */
  81
  82static const u8 regvolt[]    = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
  83static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
  84static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
  85
  86/*
  87 * Temperatures are numbered 1-6 according to the Linux kernel specification.
  88 *
  89 * In the VIA datasheet, however, the temperatures are numbered from zero.
  90 * Since it is important that this driver can easily be compared to the VIA
  91 * datasheet, we will use the VIA numbering within this driver and map the
  92 * kernel sysfs device name to the VIA number in the sysfs callback.
  93 */
  94
  95#define VT8231_REG_TEMP_LOW01	0x49
  96#define VT8231_REG_TEMP_LOW25	0x4d
  97
  98static const u8 regtemp[]    = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
  99static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
 100static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
 101
 102#define TEMP_FROM_REG(reg)		(((253 * 4 - (reg)) * 550 + 105) / 210)
 103#define TEMP_MAXMIN_FROM_REG(reg)	(((253 - (reg)) * 2200 + 105) / 210)
 104#define TEMP_MAXMIN_TO_REG(val)		(253 - ((val) * 210 + 1100) / 2200)
 105
 106#define VT8231_REG_CONFIG 0x40
 107#define VT8231_REG_ALARM1 0x41
 108#define VT8231_REG_ALARM2 0x42
 109#define VT8231_REG_FANDIV 0x47
 110#define VT8231_REG_UCH_CONFIG 0x4a
 111#define VT8231_REG_TEMP1_CONFIG 0x4b
 112#define VT8231_REG_TEMP2_CONFIG 0x4c
 113
 114/*
 115 * temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
 116 * numbering
 117 */
 118#define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
 119			      ((ch_config) >> ((i)+1)) & 0x01)
 120/* voltages 0-5 */
 121#define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
 122			      !(((ch_config) >> ((i)+2)) & 0x01))
 123
 124#define DIV_FROM_REG(val) (1 << (val))
 125
 126/*
 127 * NB  The values returned here are NOT temperatures.  The calibration curves
 128 *     for the thermistor curves are board-specific and must go in the
 129 *     sensors.conf file.  Temperature sensors are actually ten bits, but the
 130 *     VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
 131 *     register.  The temperature value returned should have a magnitude of 3,
 132 *     so we use the VIA scaling as the "true" scaling and use the remaining 2
 133 *     LSBs as fractional precision.
 134 *
 135 *     All the on-chip hardware temperature comparisons for the alarms are only
 136 *     8-bits wide, and compare against the 8 MSBs of the temperature.  The bits
 137 *     in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
 138 *     ignored.
 139 */
 140
 141/*
 142 ****** FAN RPM CONVERSIONS ********
 143 * This chip saturates back at 0, not at 255 like many the other chips.
 144 * So, 0 means 0 RPM
 145 */
 146static inline u8 FAN_TO_REG(long rpm, int div)
 147{
 148	if (rpm <= 0 || rpm > 1310720)
 149		return 0;
 150	return clamp_val(1310720 / (rpm * div), 1, 255);
 151}
 152
 153#define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
 154
 155struct vt8231_data {
 156	unsigned short addr;
 157	const char *name;
 158
 159	struct mutex update_lock;
 160	struct device *hwmon_dev;
 161	char valid;		/* !=0 if following fields are valid */
 162	unsigned long last_updated;	/* In jiffies */
 163
 164	u8 in[6];		/* Register value */
 165	u8 in_max[6];		/* Register value */
 166	u8 in_min[6];		/* Register value */
 167	u16 temp[6];		/* Register value 10 bit, right aligned */
 168	u8 temp_max[6];		/* Register value */
 169	u8 temp_min[6];		/* Register value */
 170	u8 fan[2];		/* Register value */
 171	u8 fan_min[2];		/* Register value */
 172	u8 fan_div[2];		/* Register encoding, shifted right */
 173	u16 alarms;		/* Register encoding */
 174	u8 uch_config;
 175};
 176
 177static struct pci_dev *s_bridge;
 178static int vt8231_probe(struct platform_device *pdev);
 179static int vt8231_remove(struct platform_device *pdev);
 180static struct vt8231_data *vt8231_update_device(struct device *dev);
 181static void vt8231_init_device(struct vt8231_data *data);
 182
 183static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)
 184{
 185	return inb_p(data->addr + reg);
 186}
 187
 188static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,
 189					u8 value)
 190{
 191	outb_p(value, data->addr + reg);
 192}
 193
 194/* following are the sysfs callback functions */
 195static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 196		char *buf)
 197{
 198	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 199	int nr = sensor_attr->index;
 200	struct vt8231_data *data = vt8231_update_device(dev);
 201
 202	return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
 203}
 204
 205static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 206		char *buf)
 207{
 208	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 209	int nr = sensor_attr->index;
 210	struct vt8231_data *data = vt8231_update_device(dev);
 211
 212	return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
 213}
 214
 215static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 216		char *buf)
 217{
 218	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 219	int nr = sensor_attr->index;
 220	struct vt8231_data *data = vt8231_update_device(dev);
 221
 222	return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
 223}
 224
 225static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 226		const char *buf, size_t count)
 227{
 228	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 229	int nr = sensor_attr->index;
 230	struct vt8231_data *data = dev_get_drvdata(dev);
 231	unsigned long val;
 232	int err;
 233
 234	err = kstrtoul(buf, 10, &val);
 235	if (err)
 236		return err;
 237
 238	mutex_lock(&data->update_lock);
 239	data->in_min[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);
 240	vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);
 241	mutex_unlock(&data->update_lock);
 242	return count;
 243}
 244
 245static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 246		const char *buf, size_t count)
 247{
 248	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 249	int nr = sensor_attr->index;
 250	struct vt8231_data *data = dev_get_drvdata(dev);
 251	unsigned long val;
 252	int err;
 253
 254	err = kstrtoul(buf, 10, &val);
 255	if (err)
 256		return err;
 257
 258	mutex_lock(&data->update_lock);
 259	data->in_max[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);
 260	vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);
 261	mutex_unlock(&data->update_lock);
 262	return count;
 263}
 264
 265/* Special case for input 5 as this has 3.3V scaling built into the chip */
 266static ssize_t show_in5(struct device *dev, struct device_attribute *attr,
 267		char *buf)
 268{
 269	struct vt8231_data *data = vt8231_update_device(dev);
 270
 271	return sprintf(buf, "%d\n",
 272		(((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
 273}
 274
 275static ssize_t show_in5_min(struct device *dev, struct device_attribute *attr,
 276		char *buf)
 277{
 278	struct vt8231_data *data = vt8231_update_device(dev);
 279
 280	return sprintf(buf, "%d\n",
 281		(((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
 282}
 283
 284static ssize_t show_in5_max(struct device *dev, struct device_attribute *attr,
 285		char *buf)
 286{
 287	struct vt8231_data *data = vt8231_update_device(dev);
 288
 289	return sprintf(buf, "%d\n",
 290		(((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
 291}
 292
 293static ssize_t set_in5_min(struct device *dev, struct device_attribute *attr,
 294		const char *buf, size_t count)
 295{
 296	struct vt8231_data *data = dev_get_drvdata(dev);
 297	unsigned long val;
 298	int err;
 299
 300	err = kstrtoul(buf, 10, &val);
 301	if (err)
 302		return err;
 303
 304	mutex_lock(&data->update_lock);
 305	data->in_min[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
 306				    0, 255);
 307	vt8231_write_value(data, regvoltmin[5], data->in_min[5]);
 308	mutex_unlock(&data->update_lock);
 309	return count;
 310}
 311
 312static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,
 313		const char *buf, size_t count)
 314{
 315	struct vt8231_data *data = dev_get_drvdata(dev);
 316	unsigned long val;
 317	int err;
 318
 319	err = kstrtoul(buf, 10, &val);
 320	if (err)
 321		return err;
 322
 323	mutex_lock(&data->update_lock);
 324	data->in_max[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
 325				    0, 255);
 326	vt8231_write_value(data, regvoltmax[5], data->in_max[5]);
 327	mutex_unlock(&data->update_lock);
 328	return count;
 329}
 330
 331#define define_voltage_sysfs(offset)				\
 332static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,		\
 333		show_in, NULL, offset);				\
 334static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,	\
 335		show_in_min, set_in_min, offset);		\
 336static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,	\
 337		show_in_max, set_in_max, offset)
 338
 339define_voltage_sysfs(0);
 340define_voltage_sysfs(1);
 341define_voltage_sysfs(2);
 342define_voltage_sysfs(3);
 343define_voltage_sysfs(4);
 344
 345static DEVICE_ATTR(in5_input, S_IRUGO, show_in5, NULL);
 346static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);
 347static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);
 348
 349/* Temperatures */
 350static ssize_t show_temp0(struct device *dev, struct device_attribute *attr,
 351		char *buf)
 352{
 353	struct vt8231_data *data = vt8231_update_device(dev);
 354	return sprintf(buf, "%d\n", data->temp[0] * 250);
 355}
 356
 357static ssize_t show_temp0_max(struct device *dev, struct device_attribute *attr,
 358		char *buf)
 359{
 360	struct vt8231_data *data = vt8231_update_device(dev);
 361	return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
 362}
 363
 364static ssize_t show_temp0_min(struct device *dev, struct device_attribute *attr,
 365		char *buf)
 366{
 367	struct vt8231_data *data = vt8231_update_device(dev);
 368	return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
 369}
 370
 371static ssize_t set_temp0_max(struct device *dev, struct device_attribute *attr,
 372		const char *buf, size_t count)
 373{
 374	struct vt8231_data *data = dev_get_drvdata(dev);
 375	long val;
 376	int err;
 377
 378	err = kstrtol(buf, 10, &val);
 379	if (err)
 380		return err;
 381
 382	mutex_lock(&data->update_lock);
 383	data->temp_max[0] = clamp_val((val + 500) / 1000, 0, 255);
 384	vt8231_write_value(data, regtempmax[0], data->temp_max[0]);
 385	mutex_unlock(&data->update_lock);
 386	return count;
 387}
 388static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,
 389		const char *buf, size_t count)
 390{
 391	struct vt8231_data *data = dev_get_drvdata(dev);
 392	long val;
 393	int err;
 394
 395	err = kstrtol(buf, 10, &val);
 396	if (err)
 397		return err;
 398
 399	mutex_lock(&data->update_lock);
 400	data->temp_min[0] = clamp_val((val + 500) / 1000, 0, 255);
 401	vt8231_write_value(data, regtempmin[0], data->temp_min[0]);
 402	mutex_unlock(&data->update_lock);
 403	return count;
 404}
 405
 406static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 407		char *buf)
 408{
 409	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 410	int nr = sensor_attr->index;
 411	struct vt8231_data *data = vt8231_update_device(dev);
 412	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 413}
 414
 415static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 416		char *buf)
 417{
 418	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 419	int nr = sensor_attr->index;
 420	struct vt8231_data *data = vt8231_update_device(dev);
 421	return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
 422}
 423
 424static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 425		char *buf)
 426{
 427	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 428	int nr = sensor_attr->index;
 429	struct vt8231_data *data = vt8231_update_device(dev);
 430	return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
 431}
 432
 433static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 434		const char *buf, size_t count)
 435{
 436	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 437	int nr = sensor_attr->index;
 438	struct vt8231_data *data = dev_get_drvdata(dev);
 439	long val;
 440	int err;
 441
 442	err = kstrtol(buf, 10, &val);
 443	if (err)
 444		return err;
 445
 446	mutex_lock(&data->update_lock);
 447	data->temp_max[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);
 448	vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);
 449	mutex_unlock(&data->update_lock);
 450	return count;
 451}
 452static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 453		const char *buf, size_t count)
 454{
 455	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 456	int nr = sensor_attr->index;
 457	struct vt8231_data *data = dev_get_drvdata(dev);
 458	long val;
 459	int err;
 460
 461	err = kstrtol(buf, 10, &val);
 462	if (err)
 463		return err;
 464
 465	mutex_lock(&data->update_lock);
 466	data->temp_min[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);
 467	vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);
 468	mutex_unlock(&data->update_lock);
 469	return count;
 470}
 471
 472/*
 473 * Note that these map the Linux temperature sensor numbering (1-6) to the VIA
 474 * temperature sensor numbering (0-5)
 475 */
 476#define define_temperature_sysfs(offset)				\
 477static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,		\
 478		show_temp, NULL, offset - 1);				\
 479static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,	\
 480		show_temp_max, set_temp_max, offset - 1);		\
 481static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,	\
 482		show_temp_min, set_temp_min, offset - 1)
 483
 484static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);
 485static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);
 486static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp0_min,
 487		   set_temp0_min);
 488
 489define_temperature_sysfs(2);
 490define_temperature_sysfs(3);
 491define_temperature_sysfs(4);
 492define_temperature_sysfs(5);
 493define_temperature_sysfs(6);
 494
 495/* Fans */
 496static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 497		char *buf)
 498{
 499	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 500	int nr = sensor_attr->index;
 501	struct vt8231_data *data = vt8231_update_device(dev);
 502	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 503				DIV_FROM_REG(data->fan_div[nr])));
 504}
 505
 506static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 507		char *buf)
 508{
 509	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 510	int nr = sensor_attr->index;
 511	struct vt8231_data *data = vt8231_update_device(dev);
 512	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 513			DIV_FROM_REG(data->fan_div[nr])));
 514}
 515
 516static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 517		char *buf)
 518{
 519	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 520	int nr = sensor_attr->index;
 521	struct vt8231_data *data = vt8231_update_device(dev);
 522	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 523}
 524
 525static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 526		const char *buf, size_t count)
 527{
 528	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 529	int nr = sensor_attr->index;
 530	struct vt8231_data *data = dev_get_drvdata(dev);
 531	unsigned long val;
 532	int err;
 533
 534	err = kstrtoul(buf, 10, &val);
 535	if (err)
 536		return err;
 537
 538	mutex_lock(&data->update_lock);
 539	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 540	vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 541	mutex_unlock(&data->update_lock);
 542	return count;
 543}
 544
 545static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 546		const char *buf, size_t count)
 547{
 548	struct vt8231_data *data = dev_get_drvdata(dev);
 549	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 550	unsigned long val;
 551	int nr = sensor_attr->index;
 552	int old = vt8231_read_value(data, VT8231_REG_FANDIV);
 553	long min = FAN_FROM_REG(data->fan_min[nr],
 554				 DIV_FROM_REG(data->fan_div[nr]));
 555	int err;
 556
 557	err = kstrtoul(buf, 10, &val);
 558	if (err)
 559		return err;
 560
 561	mutex_lock(&data->update_lock);
 562	switch (val) {
 563	case 1:
 564		data->fan_div[nr] = 0;
 565		break;
 566	case 2:
 567		data->fan_div[nr] = 1;
 568		break;
 569	case 4:
 570		data->fan_div[nr] = 2;
 571		break;
 572	case 8:
 573		data->fan_div[nr] = 3;
 574		break;
 575	default:
 576		dev_err(dev,
 577			"fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
 578			val);
 579		mutex_unlock(&data->update_lock);
 580		return -EINVAL;
 581	}
 582
 583	/* Correct the fan minimum speed */
 584	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 585	vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 586
 587	old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
 588	vt8231_write_value(data, VT8231_REG_FANDIV, old);
 589	mutex_unlock(&data->update_lock);
 590	return count;
 591}
 592
 593
 594#define define_fan_sysfs(offset)					\
 595static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,			\
 596		show_fan, NULL, offset - 1);				\
 597static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,		\
 598		show_fan_div, set_fan_div, offset - 1);			\
 599static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,		\
 600		show_fan_min, set_fan_min, offset - 1)
 601
 602define_fan_sysfs(1);
 603define_fan_sysfs(2);
 604
 605/* Alarms */
 606static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
 607			   char *buf)
 608{
 609	struct vt8231_data *data = vt8231_update_device(dev);
 610	return sprintf(buf, "%d\n", data->alarms);
 611}
 612static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 613
 614static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 615			  char *buf)
 616{
 617	int bitnr = to_sensor_dev_attr(attr)->index;
 618	struct vt8231_data *data = vt8231_update_device(dev);
 619	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 620}
 621static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 622static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 11);
 623static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0);
 624static SENSOR_DEVICE_ATTR(temp4_alarm, S_IRUGO, show_alarm, NULL, 1);
 625static SENSOR_DEVICE_ATTR(temp5_alarm, S_IRUGO, show_alarm, NULL, 3);
 626static SENSOR_DEVICE_ATTR(temp6_alarm, S_IRUGO, show_alarm, NULL, 8);
 627static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 11);
 628static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0);
 629static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 1);
 630static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 631static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 632static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 2);
 633static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 634static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 635
 636static ssize_t show_name(struct device *dev, struct device_attribute
 637			 *devattr, char *buf)
 638{
 639	struct vt8231_data *data = dev_get_drvdata(dev);
 640	return sprintf(buf, "%s\n", data->name);
 641}
 642static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 643
 644static struct attribute *vt8231_attributes_temps[6][5] = {
 645	{
 646		&dev_attr_temp1_input.attr,
 647		&dev_attr_temp1_max_hyst.attr,
 648		&dev_attr_temp1_max.attr,
 649		&sensor_dev_attr_temp1_alarm.dev_attr.attr,
 650		NULL
 651	}, {
 652		&sensor_dev_attr_temp2_input.dev_attr.attr,
 653		&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 654		&sensor_dev_attr_temp2_max.dev_attr.attr,
 655		&sensor_dev_attr_temp2_alarm.dev_attr.attr,
 656		NULL
 657	}, {
 658		&sensor_dev_attr_temp3_input.dev_attr.attr,
 659		&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 660		&sensor_dev_attr_temp3_max.dev_attr.attr,
 661		&sensor_dev_attr_temp3_alarm.dev_attr.attr,
 662		NULL
 663	}, {
 664		&sensor_dev_attr_temp4_input.dev_attr.attr,
 665		&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 666		&sensor_dev_attr_temp4_max.dev_attr.attr,
 667		&sensor_dev_attr_temp4_alarm.dev_attr.attr,
 668		NULL
 669	}, {
 670		&sensor_dev_attr_temp5_input.dev_attr.attr,
 671		&sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
 672		&sensor_dev_attr_temp5_max.dev_attr.attr,
 673		&sensor_dev_attr_temp5_alarm.dev_attr.attr,
 674		NULL
 675	}, {
 676		&sensor_dev_attr_temp6_input.dev_attr.attr,
 677		&sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
 678		&sensor_dev_attr_temp6_max.dev_attr.attr,
 679		&sensor_dev_attr_temp6_alarm.dev_attr.attr,
 680		NULL
 681	}
 682};
 683
 684static const struct attribute_group vt8231_group_temps[6] = {
 685	{ .attrs = vt8231_attributes_temps[0] },
 686	{ .attrs = vt8231_attributes_temps[1] },
 687	{ .attrs = vt8231_attributes_temps[2] },
 688	{ .attrs = vt8231_attributes_temps[3] },
 689	{ .attrs = vt8231_attributes_temps[4] },
 690	{ .attrs = vt8231_attributes_temps[5] },
 691};
 692
 693static struct attribute *vt8231_attributes_volts[6][5] = {
 694	{
 695		&sensor_dev_attr_in0_input.dev_attr.attr,
 696		&sensor_dev_attr_in0_min.dev_attr.attr,
 697		&sensor_dev_attr_in0_max.dev_attr.attr,
 698		&sensor_dev_attr_in0_alarm.dev_attr.attr,
 699		NULL
 700	}, {
 701		&sensor_dev_attr_in1_input.dev_attr.attr,
 702		&sensor_dev_attr_in1_min.dev_attr.attr,
 703		&sensor_dev_attr_in1_max.dev_attr.attr,
 704		&sensor_dev_attr_in1_alarm.dev_attr.attr,
 705		NULL
 706	}, {
 707		&sensor_dev_attr_in2_input.dev_attr.attr,
 708		&sensor_dev_attr_in2_min.dev_attr.attr,
 709		&sensor_dev_attr_in2_max.dev_attr.attr,
 710		&sensor_dev_attr_in2_alarm.dev_attr.attr,
 711		NULL
 712	}, {
 713		&sensor_dev_attr_in3_input.dev_attr.attr,
 714		&sensor_dev_attr_in3_min.dev_attr.attr,
 715		&sensor_dev_attr_in3_max.dev_attr.attr,
 716		&sensor_dev_attr_in3_alarm.dev_attr.attr,
 717		NULL
 718	}, {
 719		&sensor_dev_attr_in4_input.dev_attr.attr,
 720		&sensor_dev_attr_in4_min.dev_attr.attr,
 721		&sensor_dev_attr_in4_max.dev_attr.attr,
 722		&sensor_dev_attr_in4_alarm.dev_attr.attr,
 723		NULL
 724	}, {
 725		&dev_attr_in5_input.attr,
 726		&dev_attr_in5_min.attr,
 727		&dev_attr_in5_max.attr,
 728		&sensor_dev_attr_in5_alarm.dev_attr.attr,
 729		NULL
 730	}
 731};
 732
 733static const struct attribute_group vt8231_group_volts[6] = {
 734	{ .attrs = vt8231_attributes_volts[0] },
 735	{ .attrs = vt8231_attributes_volts[1] },
 736	{ .attrs = vt8231_attributes_volts[2] },
 737	{ .attrs = vt8231_attributes_volts[3] },
 738	{ .attrs = vt8231_attributes_volts[4] },
 739	{ .attrs = vt8231_attributes_volts[5] },
 740};
 741
 742static struct attribute *vt8231_attributes[] = {
 743	&sensor_dev_attr_fan1_input.dev_attr.attr,
 744	&sensor_dev_attr_fan2_input.dev_attr.attr,
 745	&sensor_dev_attr_fan1_min.dev_attr.attr,
 746	&sensor_dev_attr_fan2_min.dev_attr.attr,
 747	&sensor_dev_attr_fan1_div.dev_attr.attr,
 748	&sensor_dev_attr_fan2_div.dev_attr.attr,
 749	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
 750	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
 751	&dev_attr_alarms.attr,
 752	&dev_attr_name.attr,
 753	NULL
 754};
 755
 756static const struct attribute_group vt8231_group = {
 757	.attrs = vt8231_attributes,
 758};
 759
 760static struct platform_driver vt8231_driver = {
 761	.driver = {
 
 762		.name	= "vt8231",
 763	},
 764	.probe	= vt8231_probe,
 765	.remove	= vt8231_remove,
 766};
 767
 768static const struct pci_device_id vt8231_pci_ids[] = {
 769	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
 770	{ 0, }
 771};
 772
 773MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
 774
 775static int vt8231_pci_probe(struct pci_dev *dev,
 776				      const struct pci_device_id *id);
 777
 778static struct pci_driver vt8231_pci_driver = {
 779	.name		= "vt8231",
 780	.id_table	= vt8231_pci_ids,
 781	.probe		= vt8231_pci_probe,
 782};
 783
 784static int vt8231_probe(struct platform_device *pdev)
 785{
 786	struct resource *res;
 787	struct vt8231_data *data;
 788	int err = 0, i;
 789
 790	/* Reserve the ISA region */
 791	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 792	if (!devm_request_region(&pdev->dev, res->start, VT8231_EXTENT,
 793				 vt8231_driver.driver.name)) {
 794		dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
 795			(unsigned long)res->start, (unsigned long)res->end);
 796		return -ENODEV;
 797	}
 798
 799	data = devm_kzalloc(&pdev->dev, sizeof(struct vt8231_data), GFP_KERNEL);
 800	if (!data)
 801		return -ENOMEM;
 
 
 802
 803	platform_set_drvdata(pdev, data);
 804	data->addr = res->start;
 805	data->name = "vt8231";
 806
 807	mutex_init(&data->update_lock);
 808	vt8231_init_device(data);
 809
 810	/* Register sysfs hooks */
 811	err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group);
 812	if (err)
 813		return err;
 814
 815	/* Must update device information to find out the config field */
 816	data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);
 817
 818	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
 819		if (ISTEMP(i, data->uch_config)) {
 820			err = sysfs_create_group(&pdev->dev.kobj,
 821						 &vt8231_group_temps[i]);
 822			if (err)
 823				goto exit_remove_files;
 824		}
 825	}
 826
 827	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
 828		if (ISVOLT(i, data->uch_config)) {
 829			err = sysfs_create_group(&pdev->dev.kobj,
 830						 &vt8231_group_volts[i]);
 831			if (err)
 832				goto exit_remove_files;
 833		}
 834	}
 835
 836	data->hwmon_dev = hwmon_device_register(&pdev->dev);
 837	if (IS_ERR(data->hwmon_dev)) {
 838		err = PTR_ERR(data->hwmon_dev);
 839		goto exit_remove_files;
 840	}
 841	return 0;
 842
 843exit_remove_files:
 844	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
 845		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
 846
 847	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
 848		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
 849
 850	sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
 
 
 
 
 
 
 
 851	return err;
 852}
 853
 854static int vt8231_remove(struct platform_device *pdev)
 855{
 856	struct vt8231_data *data = platform_get_drvdata(pdev);
 857	int i;
 858
 859	hwmon_device_unregister(data->hwmon_dev);
 860
 861	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
 862		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
 863
 864	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
 865		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
 866
 867	sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
 868
 
 
 
 869	return 0;
 870}
 871
 872static void vt8231_init_device(struct vt8231_data *data)
 873{
 874	vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
 875	vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);
 876}
 877
 878static struct vt8231_data *vt8231_update_device(struct device *dev)
 879{
 880	struct vt8231_data *data = dev_get_drvdata(dev);
 881	int i;
 882	u16 low;
 883
 884	mutex_lock(&data->update_lock);
 885
 886	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 887	    || !data->valid) {
 888		for (i = 0; i < 6; i++) {
 889			if (ISVOLT(i, data->uch_config)) {
 890				data->in[i] = vt8231_read_value(data,
 891						regvolt[i]);
 892				data->in_min[i] = vt8231_read_value(data,
 893						regvoltmin[i]);
 894				data->in_max[i] = vt8231_read_value(data,
 895						regvoltmax[i]);
 896			}
 897		}
 898		for (i = 0; i < 2; i++) {
 899			data->fan[i] = vt8231_read_value(data,
 900						VT8231_REG_FAN(i));
 901			data->fan_min[i] = vt8231_read_value(data,
 902						VT8231_REG_FAN_MIN(i));
 903		}
 904
 905		low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);
 906		low = (low >> 6) | ((low & 0x30) >> 2)
 907		    | (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);
 908		for (i = 0; i < 6; i++) {
 909			if (ISTEMP(i, data->uch_config)) {
 910				data->temp[i] = (vt8231_read_value(data,
 911						       regtemp[i]) << 2)
 912						| ((low >> (2 * i)) & 0x03);
 913				data->temp_max[i] = vt8231_read_value(data,
 914						      regtempmax[i]);
 915				data->temp_min[i] = vt8231_read_value(data,
 916						      regtempmin[i]);
 917			}
 918		}
 919
 920		i = vt8231_read_value(data, VT8231_REG_FANDIV);
 921		data->fan_div[0] = (i >> 4) & 0x03;
 922		data->fan_div[1] = i >> 6;
 923		data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
 924			(vt8231_read_value(data, VT8231_REG_ALARM2) << 8);
 925
 926		/* Set alarm flags correctly */
 927		if (!data->fan[0] && data->fan_min[0])
 928			data->alarms |= 0x40;
 929		else if (data->fan[0] && !data->fan_min[0])
 930			data->alarms &= ~0x40;
 931
 932		if (!data->fan[1] && data->fan_min[1])
 933			data->alarms |= 0x80;
 934		else if (data->fan[1] && !data->fan_min[1])
 935			data->alarms &= ~0x80;
 936
 937		data->last_updated = jiffies;
 938		data->valid = 1;
 939	}
 940
 941	mutex_unlock(&data->update_lock);
 942
 943	return data;
 944}
 945
 946static int vt8231_device_add(unsigned short address)
 947{
 948	struct resource res = {
 949		.start	= address,
 950		.end	= address + VT8231_EXTENT - 1,
 951		.name	= "vt8231",
 952		.flags	= IORESOURCE_IO,
 953	};
 954	int err;
 955
 956	err = acpi_check_resource_conflict(&res);
 957	if (err)
 958		goto exit;
 959
 960	pdev = platform_device_alloc("vt8231", address);
 961	if (!pdev) {
 962		err = -ENOMEM;
 963		pr_err("Device allocation failed\n");
 964		goto exit;
 965	}
 966
 967	err = platform_device_add_resources(pdev, &res, 1);
 968	if (err) {
 969		pr_err("Device resource addition failed (%d)\n", err);
 970		goto exit_device_put;
 971	}
 972
 973	err = platform_device_add(pdev);
 974	if (err) {
 975		pr_err("Device addition failed (%d)\n", err);
 976		goto exit_device_put;
 977	}
 978
 979	return 0;
 980
 981exit_device_put:
 982	platform_device_put(pdev);
 983exit:
 984	return err;
 985}
 986
 987static int vt8231_pci_probe(struct pci_dev *dev,
 988				const struct pci_device_id *id)
 989{
 990	u16 address, val;
 991	if (force_addr) {
 992		address = force_addr & 0xff00;
 993		dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
 994			 address);
 995
 996		if (PCIBIOS_SUCCESSFUL !=
 997		    pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
 998			return -ENODEV;
 999	}
1000
1001	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
1002							&val))
1003		return -ENODEV;
1004
1005	address = val & ~(VT8231_EXTENT - 1);
1006	if (address == 0) {
1007		dev_err(&dev->dev, "base address not set - upgrade BIOS or use force_addr=0xaddr\n");
1008		return -ENODEV;
1009	}
1010
1011	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
1012							&val))
1013		return -ENODEV;
1014
1015	if (!(val & 0x0001)) {
1016		dev_warn(&dev->dev, "enabling sensors\n");
1017		if (PCIBIOS_SUCCESSFUL !=
1018			pci_write_config_word(dev, VT8231_ENABLE_REG,
1019							val | 0x0001))
1020			return -ENODEV;
1021	}
1022
1023	if (platform_driver_register(&vt8231_driver))
1024		goto exit;
1025
1026	/* Sets global pdev as a side effect */
1027	if (vt8231_device_add(address))
1028		goto exit_unregister;
1029
1030	/*
1031	 * Always return failure here.  This is to allow other drivers to bind
1032	 * to this pci device.  We don't really want to have control over the
1033	 * pci device, we only wanted to read as few register values from it.
1034	 */
1035
1036	/*
1037	 * We do, however, mark ourselves as using the PCI device to stop it
1038	 * getting unloaded.
1039	 */
1040	s_bridge = pci_dev_get(dev);
1041	return -ENODEV;
1042
1043exit_unregister:
1044	platform_driver_unregister(&vt8231_driver);
1045exit:
1046	return -ENODEV;
1047}
1048
1049static int __init sm_vt8231_init(void)
1050{
1051	return pci_register_driver(&vt8231_pci_driver);
1052}
1053
1054static void __exit sm_vt8231_exit(void)
1055{
1056	pci_unregister_driver(&vt8231_pci_driver);
1057	if (s_bridge != NULL) {
1058		platform_device_unregister(pdev);
1059		platform_driver_unregister(&vt8231_driver);
1060		pci_dev_put(s_bridge);
1061		s_bridge = NULL;
1062	}
1063}
1064
1065MODULE_AUTHOR("Roger Lucas <vt8231@hiddenengine.co.uk>");
1066MODULE_DESCRIPTION("VT8231 sensors");
1067MODULE_LICENSE("GPL");
1068
1069module_init(sm_vt8231_init);
1070module_exit(sm_vt8231_exit);