1/*
   2 * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
   3 *	       monitoring
   4 * Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
   5 *
   6 * Based on max6650.c:
   7 * Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
   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#include <linux/kernel.h>	/* Needed for KERN_INFO */
  25#include <linux/module.h>
  26#include <linux/init.h>
  27#include <linux/slab.h>
  28#include <linux/jiffies.h>
  29#include <linux/i2c.h>
  30#include <linux/hwmon.h>
  31#include <linux/hwmon-sysfs.h>
  32#include <linux/err.h>
  33#include <linux/mutex.h>
  34
  35/*
  36 * Addresses to scan.
  37 */
  38
  39static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
  40	0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
  41
  42/*
  43 * Insmod parameters
  44 */
  45
  46static int pwminv;	/*Inverted PWM output. */
  47module_param(pwminv, int, S_IRUGO);
  48
  49static int init = 1; /*Power-on initialization.*/
  50module_param(init, int, S_IRUGO);
  51
  52enum chips { amc6821 };
  53
  54#define AMC6821_REG_DEV_ID 0x3D
  55#define AMC6821_REG_COMP_ID 0x3E
  56#define AMC6821_REG_CONF1 0x00
  57#define AMC6821_REG_CONF2 0x01
  58#define AMC6821_REG_CONF3 0x3F
  59#define AMC6821_REG_CONF4 0x04
  60#define AMC6821_REG_STAT1 0x02
  61#define AMC6821_REG_STAT2 0x03
  62#define AMC6821_REG_TDATA_LOW 0x08
  63#define AMC6821_REG_TDATA_HI 0x09
  64#define AMC6821_REG_LTEMP_HI 0x0A
  65#define AMC6821_REG_RTEMP_HI 0x0B
  66#define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
  67#define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
  68#define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
  69#define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
  70#define AMC6821_REG_LTEMP_CRIT 0x1B
  71#define AMC6821_REG_RTEMP_CRIT 0x1D
  72#define AMC6821_REG_PSV_TEMP 0x1C
  73#define AMC6821_REG_DCY 0x22
  74#define AMC6821_REG_LTEMP_FAN_CTRL 0x24
  75#define AMC6821_REG_RTEMP_FAN_CTRL 0x25
  76#define AMC6821_REG_DCY_LOW_TEMP 0x21
  77
  78#define AMC6821_REG_TACH_LLIMITL 0x10
  79#define AMC6821_REG_TACH_LLIMITH 0x11
  80#define AMC6821_REG_TACH_HLIMITL 0x12
  81#define AMC6821_REG_TACH_HLIMITH 0x13
  82
  83#define AMC6821_CONF1_START 0x01
  84#define AMC6821_CONF1_FAN_INT_EN 0x02
  85#define AMC6821_CONF1_FANIE 0x04
  86#define AMC6821_CONF1_PWMINV 0x08
  87#define AMC6821_CONF1_FAN_FAULT_EN 0x10
  88#define AMC6821_CONF1_FDRC0 0x20
  89#define AMC6821_CONF1_FDRC1 0x40
  90#define AMC6821_CONF1_THERMOVIE 0x80
  91
  92#define AMC6821_CONF2_PWM_EN 0x01
  93#define AMC6821_CONF2_TACH_MODE 0x02
  94#define AMC6821_CONF2_TACH_EN 0x04
  95#define AMC6821_CONF2_RTFIE 0x08
  96#define AMC6821_CONF2_LTOIE 0x10
  97#define AMC6821_CONF2_RTOIE 0x20
  98#define AMC6821_CONF2_PSVIE 0x40
  99#define AMC6821_CONF2_RST 0x80
 100
 101#define AMC6821_CONF3_THERM_FAN_EN 0x80
 102#define AMC6821_CONF3_REV_MASK 0x0F
 103
 104#define AMC6821_CONF4_OVREN 0x10
 105#define AMC6821_CONF4_TACH_FAST 0x20
 106#define AMC6821_CONF4_PSPR 0x40
 107#define AMC6821_CONF4_MODE 0x80
 108
 109#define AMC6821_STAT1_RPM_ALARM 0x01
 110#define AMC6821_STAT1_FANS 0x02
 111#define AMC6821_STAT1_RTH 0x04
 112#define AMC6821_STAT1_RTL 0x08
 113#define AMC6821_STAT1_R_THERM 0x10
 114#define AMC6821_STAT1_RTF 0x20
 115#define AMC6821_STAT1_LTH 0x40
 116#define AMC6821_STAT1_LTL 0x80
 117
 118#define AMC6821_STAT2_RTC 0x08
 119#define AMC6821_STAT2_LTC 0x10
 120#define AMC6821_STAT2_LPSV 0x20
 121#define AMC6821_STAT2_L_THERM 0x40
 122#define AMC6821_STAT2_THERM_IN 0x80
 123
 124enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
 125	IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
 126	IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
 127	TEMP_IDX_LEN, };
 128
 129static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
 130			AMC6821_REG_LTEMP_LIMIT_MIN,
 131			AMC6821_REG_LTEMP_LIMIT_MAX,
 132			AMC6821_REG_LTEMP_CRIT,
 133			AMC6821_REG_RTEMP_HI,
 134			AMC6821_REG_RTEMP_LIMIT_MIN,
 135			AMC6821_REG_RTEMP_LIMIT_MAX,
 136			AMC6821_REG_RTEMP_CRIT, };
 137
 138enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
 139	FAN1_IDX_LEN, };
 140
 141static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
 142			AMC6821_REG_TACH_LLIMITL,
 143			AMC6821_REG_TACH_HLIMITL, };
 144
 145
 146static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
 147			AMC6821_REG_TACH_LLIMITH,
 148			AMC6821_REG_TACH_HLIMITH, };
 149
 150/*
 151 * Client data (each client gets its own)
 152 */
 153
 154struct amc6821_data {
 155	struct i2c_client *client;
 156	struct mutex update_lock;
 157	char valid; /* zero until following fields are valid */
 158	unsigned long last_updated; /* in jiffies */
 159
 160	/* register values */
 161	int temp[TEMP_IDX_LEN];
 162
 163	u16 fan[FAN1_IDX_LEN];
 164	u8 fan1_div;
 165
 166	u8 pwm1;
 167	u8 temp1_auto_point_temp[3];
 168	u8 temp2_auto_point_temp[3];
 169	u8 pwm1_auto_point_pwm[3];
 170	u8 pwm1_enable;
 171	u8 pwm1_auto_channels_temp;
 172
 173	u8 stat1;
 174	u8 stat2;
 175};
 176
 177static struct amc6821_data *amc6821_update_device(struct device *dev)
 178{
 179	struct amc6821_data *data = dev_get_drvdata(dev);
 180	struct i2c_client *client = data->client;
 181	int timeout = HZ;
 182	u8 reg;
 183	int i;
 184
 185	mutex_lock(&data->update_lock);
 186
 187	if (time_after(jiffies, data->last_updated + timeout) ||
 188			!data->valid) {
 189
 190		for (i = 0; i < TEMP_IDX_LEN; i++)
 191			data->temp[i] = (int8_t)i2c_smbus_read_byte_data(
 192				client, temp_reg[i]);
 193
 194		data->stat1 = i2c_smbus_read_byte_data(client,
 195			AMC6821_REG_STAT1);
 196		data->stat2 = i2c_smbus_read_byte_data(client,
 197			AMC6821_REG_STAT2);
 198
 199		data->pwm1 = i2c_smbus_read_byte_data(client,
 200			AMC6821_REG_DCY);
 201		for (i = 0; i < FAN1_IDX_LEN; i++) {
 202			data->fan[i] = i2c_smbus_read_byte_data(
 203					client,
 204					fan_reg_low[i]);
 205			data->fan[i] += i2c_smbus_read_byte_data(
 206					client,
 207					fan_reg_hi[i]) << 8;
 208		}
 209		data->fan1_div = i2c_smbus_read_byte_data(client,
 210			AMC6821_REG_CONF4);
 211		data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
 212
 213		data->pwm1_auto_point_pwm[0] = 0;
 214		data->pwm1_auto_point_pwm[2] = 255;
 215		data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
 216			AMC6821_REG_DCY_LOW_TEMP);
 217
 218		data->temp1_auto_point_temp[0] =
 219			i2c_smbus_read_byte_data(client,
 220					AMC6821_REG_PSV_TEMP);
 221		data->temp2_auto_point_temp[0] =
 222				data->temp1_auto_point_temp[0];
 223		reg = i2c_smbus_read_byte_data(client,
 224			AMC6821_REG_LTEMP_FAN_CTRL);
 225		data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
 226		reg &= 0x07;
 227		reg = 0x20 >> reg;
 228		if (reg > 0)
 229			data->temp1_auto_point_temp[2] =
 230				data->temp1_auto_point_temp[1] +
 231				(data->pwm1_auto_point_pwm[2] -
 232				data->pwm1_auto_point_pwm[1]) / reg;
 233		else
 234			data->temp1_auto_point_temp[2] = 255;
 235
 236		reg = i2c_smbus_read_byte_data(client,
 237			AMC6821_REG_RTEMP_FAN_CTRL);
 238		data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
 239		reg &= 0x07;
 240		reg = 0x20 >> reg;
 241		if (reg > 0)
 242			data->temp2_auto_point_temp[2] =
 243				data->temp2_auto_point_temp[1] +
 244				(data->pwm1_auto_point_pwm[2] -
 245				data->pwm1_auto_point_pwm[1]) / reg;
 246		else
 247			data->temp2_auto_point_temp[2] = 255;
 248
 249		reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
 250		reg = (reg >> 5) & 0x3;
 251		switch (reg) {
 252		case 0: /*open loop: software sets pwm1*/
 253			data->pwm1_auto_channels_temp = 0;
 254			data->pwm1_enable = 1;
 255			break;
 256		case 2: /*closed loop: remote T (temp2)*/
 257			data->pwm1_auto_channels_temp = 2;
 258			data->pwm1_enable = 2;
 259			break;
 260		case 3: /*closed loop: local and remote T (temp2)*/
 261			data->pwm1_auto_channels_temp = 3;
 262			data->pwm1_enable = 3;
 263			break;
 264		case 1: /*
 265			 * semi-open loop: software sets rpm, chip controls
 266			 * pwm1, currently not implemented
 267			 */
 268			data->pwm1_auto_channels_temp = 0;
 269			data->pwm1_enable = 0;
 270			break;
 271		}
 272
 273		data->last_updated = jiffies;
 274		data->valid = 1;
 275	}
 276	mutex_unlock(&data->update_lock);
 277	return data;
 278}
 279
 280static ssize_t get_temp(
 281		struct device *dev,
 282		struct device_attribute *devattr,
 283		char *buf)
 284{
 285	struct amc6821_data *data = amc6821_update_device(dev);
 286	int ix = to_sensor_dev_attr(devattr)->index;
 287
 288	return sprintf(buf, "%d\n", data->temp[ix] * 1000);
 289}
 290
 291static ssize_t set_temp(
 292		struct device *dev,
 293		struct device_attribute *attr,
 294		const char *buf,
 295		size_t count)
 296{
 297	struct amc6821_data *data = dev_get_drvdata(dev);
 298	struct i2c_client *client = data->client;
 299	int ix = to_sensor_dev_attr(attr)->index;
 300	long val;
 301
 302	int ret = kstrtol(buf, 10, &val);
 303	if (ret)
 304		return ret;
 305	val = clamp_val(val / 1000, -128, 127);
 306
 307	mutex_lock(&data->update_lock);
 308	data->temp[ix] = val;
 309	if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
 310		dev_err(&client->dev, "Register write error, aborting.\n");
 311		count = -EIO;
 312	}
 313	mutex_unlock(&data->update_lock);
 314	return count;
 315}
 316
 317static ssize_t get_temp_alarm(
 318	struct device *dev,
 319	struct device_attribute *devattr,
 320	char *buf)
 321{
 322	struct amc6821_data *data = amc6821_update_device(dev);
 323	int ix = to_sensor_dev_attr(devattr)->index;
 324	u8 flag;
 325
 326	switch (ix) {
 327	case IDX_TEMP1_MIN:
 328		flag = data->stat1 & AMC6821_STAT1_LTL;
 329		break;
 330	case IDX_TEMP1_MAX:
 331		flag = data->stat1 & AMC6821_STAT1_LTH;
 332		break;
 333	case IDX_TEMP1_CRIT:
 334		flag = data->stat2 & AMC6821_STAT2_LTC;
 335		break;
 336	case IDX_TEMP2_MIN:
 337		flag = data->stat1 & AMC6821_STAT1_RTL;
 338		break;
 339	case IDX_TEMP2_MAX:
 340		flag = data->stat1 & AMC6821_STAT1_RTH;
 341		break;
 342	case IDX_TEMP2_CRIT:
 343		flag = data->stat2 & AMC6821_STAT2_RTC;
 344		break;
 345	default:
 346		dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
 347		return -EINVAL;
 348	}
 349	if (flag)
 350		return sprintf(buf, "1");
 351	else
 352		return sprintf(buf, "0");
 353}
 354
 355static ssize_t get_temp2_fault(
 356		struct device *dev,
 357		struct device_attribute *devattr,
 358		char *buf)
 359{
 360	struct amc6821_data *data = amc6821_update_device(dev);
 361	if (data->stat1 & AMC6821_STAT1_RTF)
 362		return sprintf(buf, "1");
 363	else
 364		return sprintf(buf, "0");
 365}
 366
 367static ssize_t get_pwm1(
 368		struct device *dev,
 369		struct device_attribute *devattr,
 370		char *buf)
 371{
 372	struct amc6821_data *data = amc6821_update_device(dev);
 373	return sprintf(buf, "%d\n", data->pwm1);
 374}
 375
 376static ssize_t set_pwm1(
 377		struct device *dev,
 378		struct device_attribute *devattr,
 379		const char *buf,
 380		size_t count)
 381{
 382	struct amc6821_data *data = dev_get_drvdata(dev);
 383	struct i2c_client *client = data->client;
 384	long val;
 385	int ret = kstrtol(buf, 10, &val);
 386	if (ret)
 387		return ret;
 388
 389	mutex_lock(&data->update_lock);
 390	data->pwm1 = clamp_val(val , 0, 255);
 391	i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
 392	mutex_unlock(&data->update_lock);
 393	return count;
 394}
 395
 396static ssize_t get_pwm1_enable(
 397		struct device *dev,
 398		struct device_attribute *devattr,
 399		char *buf)
 400{
 401	struct amc6821_data *data = amc6821_update_device(dev);
 402	return sprintf(buf, "%d\n", data->pwm1_enable);
 403}
 404
 405static ssize_t set_pwm1_enable(
 406		struct device *dev,
 407		struct device_attribute *attr,
 408		const char *buf,
 409		size_t count)
 410{
 411	struct amc6821_data *data = dev_get_drvdata(dev);
 412	struct i2c_client *client = data->client;
 413	long val;
 414	int config = kstrtol(buf, 10, &val);
 415	if (config)
 416		return config;
 417
 418	mutex_lock(&data->update_lock);
 419	config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
 420	if (config < 0) {
 421			dev_err(&client->dev,
 422			"Error reading configuration register, aborting.\n");
 423			count = config;
 424			goto unlock;
 425	}
 426
 427	switch (val) {
 428	case 1:
 429		config &= ~AMC6821_CONF1_FDRC0;
 430		config &= ~AMC6821_CONF1_FDRC1;
 431		break;
 432	case 2:
 433		config &= ~AMC6821_CONF1_FDRC0;
 434		config |= AMC6821_CONF1_FDRC1;
 435		break;
 436	case 3:
 437		config |= AMC6821_CONF1_FDRC0;
 438		config |= AMC6821_CONF1_FDRC1;
 439		break;
 440	default:
 441		count = -EINVAL;
 442		goto unlock;
 443	}
 444	if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
 445			dev_err(&client->dev,
 446			"Configuration register write error, aborting.\n");
 447			count = -EIO;
 448	}
 449unlock:
 450	mutex_unlock(&data->update_lock);
 451	return count;
 452}
 453
 454static ssize_t get_pwm1_auto_channels_temp(
 455		struct device *dev,
 456		struct device_attribute *devattr,
 457		char *buf)
 458{
 459	struct amc6821_data *data = amc6821_update_device(dev);
 460	return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
 461}
 462
 463static ssize_t get_temp_auto_point_temp(
 464		struct device *dev,
 465		struct device_attribute *devattr,
 466		char *buf)
 467{
 468	int ix = to_sensor_dev_attr_2(devattr)->index;
 469	int nr = to_sensor_dev_attr_2(devattr)->nr;
 470	struct amc6821_data *data = amc6821_update_device(dev);
 471	switch (nr) {
 472	case 1:
 473		return sprintf(buf, "%d\n",
 474			data->temp1_auto_point_temp[ix] * 1000);
 475	case 2:
 476		return sprintf(buf, "%d\n",
 477			data->temp2_auto_point_temp[ix] * 1000);
 478	default:
 479		dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
 480		return -EINVAL;
 481	}
 482}
 483
 484static ssize_t get_pwm1_auto_point_pwm(
 485		struct device *dev,
 486		struct device_attribute *devattr,
 487		char *buf)
 488{
 489	int ix = to_sensor_dev_attr(devattr)->index;
 490	struct amc6821_data *data = amc6821_update_device(dev);
 491	return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
 492}
 493
 494static inline ssize_t set_slope_register(struct i2c_client *client,
 495		u8 reg,
 496		u8 dpwm,
 497		u8 *ptemp)
 498{
 499	int dt;
 500	u8 tmp;
 501
 502	dt = ptemp[2]-ptemp[1];
 503	for (tmp = 4; tmp > 0; tmp--) {
 504		if (dt * (0x20 >> tmp) >= dpwm)
 505			break;
 506	}
 507	tmp |= (ptemp[1] & 0x7C) << 1;
 508	if (i2c_smbus_write_byte_data(client,
 509			reg, tmp)) {
 510		dev_err(&client->dev, "Register write error, aborting.\n");
 511		return -EIO;
 512	}
 513	return 0;
 514}
 515
 516static ssize_t set_temp_auto_point_temp(
 517		struct device *dev,
 518		struct device_attribute *attr,
 519		const char *buf,
 520		size_t count)
 521{
 522	struct amc6821_data *data = amc6821_update_device(dev);
 523	struct i2c_client *client = data->client;
 524	int ix = to_sensor_dev_attr_2(attr)->index;
 525	int nr = to_sensor_dev_attr_2(attr)->nr;
 526	u8 *ptemp;
 527	u8 reg;
 528	int dpwm;
 529	long val;
 530	int ret = kstrtol(buf, 10, &val);
 531	if (ret)
 532		return ret;
 533
 534	switch (nr) {
 535	case 1:
 536		ptemp = data->temp1_auto_point_temp;
 537		reg = AMC6821_REG_LTEMP_FAN_CTRL;
 538		break;
 539	case 2:
 540		ptemp = data->temp2_auto_point_temp;
 541		reg = AMC6821_REG_RTEMP_FAN_CTRL;
 542		break;
 543	default:
 544		dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
 545		return -EINVAL;
 546	}
 547
 548	mutex_lock(&data->update_lock);
 549	data->valid = 0;
 550
 551	switch (ix) {
 552	case 0:
 553		ptemp[0] = clamp_val(val / 1000, 0,
 554				     data->temp1_auto_point_temp[1]);
 555		ptemp[0] = clamp_val(ptemp[0], 0,
 556				     data->temp2_auto_point_temp[1]);
 557		ptemp[0] = clamp_val(ptemp[0], 0, 63);
 558		if (i2c_smbus_write_byte_data(
 559					client,
 560					AMC6821_REG_PSV_TEMP,
 561					ptemp[0])) {
 562				dev_err(&client->dev,
 563					"Register write error, aborting.\n");
 564				count = -EIO;
 565		}
 566		goto EXIT;
 567	case 1:
 568		ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
 569		ptemp[1] &= 0x7C;
 570		ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
 571		break;
 572	case 2:
 573		ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
 574		break;
 575	default:
 576		dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
 577		count = -EINVAL;
 578		goto EXIT;
 579	}
 580	dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
 581	if (set_slope_register(client, reg, dpwm, ptemp))
 582		count = -EIO;
 583
 584EXIT:
 585	mutex_unlock(&data->update_lock);
 586	return count;
 587}
 588
 589static ssize_t set_pwm1_auto_point_pwm(
 590		struct device *dev,
 591		struct device_attribute *attr,
 592		const char *buf,
 593		size_t count)
 594{
 595	struct amc6821_data *data = dev_get_drvdata(dev);
 596	struct i2c_client *client = data->client;
 597	int dpwm;
 598	long val;
 599	int ret = kstrtol(buf, 10, &val);
 600	if (ret)
 601		return ret;
 602
 603	mutex_lock(&data->update_lock);
 604	data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
 605	if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
 606			data->pwm1_auto_point_pwm[1])) {
 607		dev_err(&client->dev, "Register write error, aborting.\n");
 608		count = -EIO;
 609		goto EXIT;
 610	}
 611	dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
 612	if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
 613			data->temp1_auto_point_temp)) {
 614		count = -EIO;
 615		goto EXIT;
 616	}
 617	if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
 618			data->temp2_auto_point_temp)) {
 619		count = -EIO;
 620		goto EXIT;
 621	}
 622
 623EXIT:
 624	data->valid = 0;
 625	mutex_unlock(&data->update_lock);
 626	return count;
 627}
 628
 629static ssize_t get_fan(
 630		struct device *dev,
 631		struct device_attribute *devattr,
 632		char *buf)
 633{
 634	struct amc6821_data *data = amc6821_update_device(dev);
 635	int ix = to_sensor_dev_attr(devattr)->index;
 636	if (0 == data->fan[ix])
 637		return sprintf(buf, "0");
 638	return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
 639}
 640
 641static ssize_t get_fan1_fault(
 642		struct device *dev,
 643		struct device_attribute *devattr,
 644		char *buf)
 645{
 646	struct amc6821_data *data = amc6821_update_device(dev);
 647	if (data->stat1 & AMC6821_STAT1_FANS)
 648		return sprintf(buf, "1");
 649	else
 650		return sprintf(buf, "0");
 651}
 652
 653static ssize_t set_fan(
 654		struct device *dev,
 655		struct device_attribute *attr,
 656		const char *buf, size_t count)
 657{
 658	struct amc6821_data *data = dev_get_drvdata(dev);
 659	struct i2c_client *client = data->client;
 660	long val;
 661	int ix = to_sensor_dev_attr(attr)->index;
 662	int ret = kstrtol(buf, 10, &val);
 663	if (ret)
 664		return ret;
 665	val = 1 > val ? 0xFFFF : 6000000/val;
 666
 667	mutex_lock(&data->update_lock);
 668	data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
 669	if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
 670			data->fan[ix] & 0xFF)) {
 671		dev_err(&client->dev, "Register write error, aborting.\n");
 672		count = -EIO;
 673		goto EXIT;
 674	}
 675	if (i2c_smbus_write_byte_data(client,
 676			fan_reg_hi[ix], data->fan[ix] >> 8)) {
 677		dev_err(&client->dev, "Register write error, aborting.\n");
 678		count = -EIO;
 679	}
 680EXIT:
 681	mutex_unlock(&data->update_lock);
 682	return count;
 683}
 684
 685static ssize_t get_fan1_div(
 686		struct device *dev,
 687		struct device_attribute *devattr,
 688		char *buf)
 689{
 690	struct amc6821_data *data = amc6821_update_device(dev);
 691	return sprintf(buf, "%d\n", data->fan1_div);
 692}
 693
 694static ssize_t set_fan1_div(
 695		struct device *dev,
 696		struct device_attribute *attr,
 697		const char *buf, size_t count)
 698{
 699	struct amc6821_data *data = dev_get_drvdata(dev);
 700	struct i2c_client *client = data->client;
 701	long val;
 702	int config = kstrtol(buf, 10, &val);
 703	if (config)
 704		return config;
 705
 706	mutex_lock(&data->update_lock);
 707	config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
 708	if (config < 0) {
 709		dev_err(&client->dev,
 710			"Error reading configuration register, aborting.\n");
 711		count = config;
 712		goto EXIT;
 713	}
 714	switch (val) {
 715	case 2:
 716		config &= ~AMC6821_CONF4_PSPR;
 717		data->fan1_div = 2;
 718		break;
 719	case 4:
 720		config |= AMC6821_CONF4_PSPR;
 721		data->fan1_div = 4;
 722		break;
 723	default:
 724		count = -EINVAL;
 725		goto EXIT;
 726	}
 727	if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
 728		dev_err(&client->dev,
 729			"Configuration register write error, aborting.\n");
 730		count = -EIO;
 731	}
 732EXIT:
 733	mutex_unlock(&data->update_lock);
 734	return count;
 735}
 736
 737static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
 738	get_temp, NULL, IDX_TEMP1_INPUT);
 739static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
 740	set_temp, IDX_TEMP1_MIN);
 741static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
 742	set_temp, IDX_TEMP1_MAX);
 743static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
 744	set_temp, IDX_TEMP1_CRIT);
 745static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
 746	get_temp_alarm, NULL, IDX_TEMP1_MIN);
 747static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
 748	get_temp_alarm, NULL, IDX_TEMP1_MAX);
 749static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
 750	get_temp_alarm, NULL, IDX_TEMP1_CRIT);
 751static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO,
 752	get_temp, NULL, IDX_TEMP2_INPUT);
 753static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
 754	set_temp, IDX_TEMP2_MIN);
 755static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
 756	set_temp, IDX_TEMP2_MAX);
 757static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
 758	set_temp, IDX_TEMP2_CRIT);
 759static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
 760	get_temp2_fault, NULL, 0);
 761static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
 762	get_temp_alarm, NULL, IDX_TEMP2_MIN);
 763static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
 764	get_temp_alarm, NULL, IDX_TEMP2_MAX);
 765static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
 766	get_temp_alarm, NULL, IDX_TEMP2_CRIT);
 767static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
 768static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
 769	get_fan, set_fan, IDX_FAN1_MIN);
 770static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
 771	get_fan, set_fan, IDX_FAN1_MAX);
 772static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
 773static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 774	get_fan1_div, set_fan1_div, 0);
 775
 776static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
 777static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
 778	get_pwm1_enable, set_pwm1_enable, 0);
 779static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
 780	get_pwm1_auto_point_pwm, NULL, 0);
 781static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
 782	get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
 783static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
 784	get_pwm1_auto_point_pwm, NULL, 2);
 785static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
 786	get_pwm1_auto_channels_temp, NULL, 0);
 787static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
 788	get_temp_auto_point_temp, NULL, 1, 0);
 789static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
 790	get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
 791static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
 792	get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
 793
 794static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
 795	get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
 796static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
 797	get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
 798static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
 799	get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
 800
 801static struct attribute *amc6821_attrs[] = {
 802	&sensor_dev_attr_temp1_input.dev_attr.attr,
 803	&sensor_dev_attr_temp1_min.dev_attr.attr,
 804	&sensor_dev_attr_temp1_max.dev_attr.attr,
 805	&sensor_dev_attr_temp1_crit.dev_attr.attr,
 806	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 807	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 808	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 809	&sensor_dev_attr_temp2_input.dev_attr.attr,
 810	&sensor_dev_attr_temp2_min.dev_attr.attr,
 811	&sensor_dev_attr_temp2_max.dev_attr.attr,
 812	&sensor_dev_attr_temp2_crit.dev_attr.attr,
 813	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 814	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 815	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 816	&sensor_dev_attr_temp2_fault.dev_attr.attr,
 817	&sensor_dev_attr_fan1_input.dev_attr.attr,
 818	&sensor_dev_attr_fan1_min.dev_attr.attr,
 819	&sensor_dev_attr_fan1_max.dev_attr.attr,
 820	&sensor_dev_attr_fan1_fault.dev_attr.attr,
 821	&sensor_dev_attr_fan1_div.dev_attr.attr,
 822	&sensor_dev_attr_pwm1.dev_attr.attr,
 823	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
 824	&sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
 825	&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
 826	&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
 827	&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
 828	&sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
 829	&sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
 830	&sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
 831	&sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
 832	&sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
 833	&sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
 834	NULL
 835};
 836
 837ATTRIBUTE_GROUPS(amc6821);
 838
 839/* Return 0 if detection is successful, -ENODEV otherwise */
 840static int amc6821_detect(
 841		struct i2c_client *client,
 842		struct i2c_board_info *info)
 843{
 844	struct i2c_adapter *adapter = client->adapter;
 845	int address = client->addr;
 846	int dev_id, comp_id;
 847
 848	dev_dbg(&adapter->dev, "amc6821_detect called.\n");
 849
 850	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 851		dev_dbg(&adapter->dev,
 852			"amc6821: I2C bus doesn't support byte mode, "
 853			"skipping.\n");
 854		return -ENODEV;
 855	}
 856
 857	dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
 858	comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
 859	if (dev_id != 0x21 || comp_id != 0x49) {
 860		dev_dbg(&adapter->dev,
 861			"amc6821: detection failed at 0x%02x.\n",
 862			address);
 863		return -ENODEV;
 864	}
 865
 866	/*
 867	 * Bit 7 of the address register is ignored, so we can check the
 868	 * ID registers again
 869	 */
 870	dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
 871	comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
 872	if (dev_id != 0x21 || comp_id != 0x49) {
 873		dev_dbg(&adapter->dev,
 874			"amc6821: detection failed at 0x%02x.\n",
 875			address);
 876		return -ENODEV;
 877	}
 878
 879	dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
 880	strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
 881
 882	return 0;
 883}
 884
 885static int amc6821_init_client(struct i2c_client *client)
 886{
 887	int config;
 888	int err = -EIO;
 889
 890	if (init) {
 891		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
 892
 893		if (config < 0) {
 894				dev_err(&client->dev,
 895			"Error reading configuration register, aborting.\n");
 896				return err;
 897		}
 898
 899		config |= AMC6821_CONF4_MODE;
 900
 901		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
 902				config)) {
 903			dev_err(&client->dev,
 904			"Configuration register write error, aborting.\n");
 905			return err;
 906		}
 907
 908		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
 909
 910		if (config < 0) {
 911			dev_err(&client->dev,
 912			"Error reading configuration register, aborting.\n");
 913			return err;
 914		}
 915
 916		dev_info(&client->dev, "Revision %d\n", config & 0x0f);
 917
 918		config &= ~AMC6821_CONF3_THERM_FAN_EN;
 919
 920		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
 921				config)) {
 922			dev_err(&client->dev,
 923			"Configuration register write error, aborting.\n");
 924			return err;
 925		}
 926
 927		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
 928
 929		if (config < 0) {
 930			dev_err(&client->dev,
 931			"Error reading configuration register, aborting.\n");
 932			return err;
 933		}
 934
 935		config &= ~AMC6821_CONF2_RTFIE;
 936		config &= ~AMC6821_CONF2_LTOIE;
 937		config &= ~AMC6821_CONF2_RTOIE;
 938		if (i2c_smbus_write_byte_data(client,
 939				AMC6821_REG_CONF2, config)) {
 940			dev_err(&client->dev,
 941			"Configuration register write error, aborting.\n");
 942			return err;
 943		}
 944
 945		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
 946
 947		if (config < 0) {
 948			dev_err(&client->dev,
 949			"Error reading configuration register, aborting.\n");
 950			return err;
 951		}
 952
 953		config &= ~AMC6821_CONF1_THERMOVIE;
 954		config &= ~AMC6821_CONF1_FANIE;
 955		config |= AMC6821_CONF1_START;
 956		if (pwminv)
 957			config |= AMC6821_CONF1_PWMINV;
 958		else
 959			config &= ~AMC6821_CONF1_PWMINV;
 960
 961		if (i2c_smbus_write_byte_data(
 962				client, AMC6821_REG_CONF1, config)) {
 963			dev_err(&client->dev,
 964			"Configuration register write error, aborting.\n");
 965			return err;
 966		}
 967	}
 968	return 0;
 969}
 970
 971static int amc6821_probe(struct i2c_client *client,
 972			 const struct i2c_device_id *id)
 973{
 974	struct device *dev = &client->dev;
 975	struct amc6821_data *data;
 976	struct device *hwmon_dev;
 977	int err;
 978
 979	data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
 980	if (!data)
 981		return -ENOMEM;
 982
 983	data->client = client;
 984	mutex_init(&data->update_lock);
 985
 986	/*
 987	 * Initialize the amc6821 chip
 988	 */
 989	err = amc6821_init_client(client);
 990	if (err)
 991		return err;
 992
 993	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 994							   data,
 995							   amc6821_groups);
 996	return PTR_ERR_OR_ZERO(hwmon_dev);
 997}
 998
 999static const struct i2c_device_id amc6821_id[] = {
1000	{ "amc6821", amc6821 },
1001	{ }
1002};
1003
1004MODULE_DEVICE_TABLE(i2c, amc6821_id);
1005
1006static struct i2c_driver amc6821_driver = {
1007	.class = I2C_CLASS_HWMON,
1008	.driver = {
1009		.name	= "amc6821",
1010	},
1011	.probe = amc6821_probe,
1012	.id_table = amc6821_id,
1013	.detect = amc6821_detect,
1014	.address_list = normal_i2c,
1015};
1016
1017module_i2c_driver(amc6821_driver);
1018
1019MODULE_LICENSE("GPL");
1020MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1021MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");