lineage-pem.c 15.6 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575
/*
 * Driver for Lineage Compact Power Line series of power entry modules.
 *
 * Copyright (C) 2010, 2011 Ericsson AB.
 *
 * Documentation:
 *  http://www.lineagepower.com/oem/pdf/CPLI2C.pdf
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>

/*
 * This driver supports various Lineage Compact Power Line DC/DC and AC/DC
 * converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others.
 *
 * The devices are nominally PMBus compliant. However, most standard PMBus
 * commands are not supported. Specifically, all hardware monitoring and
 * status reporting commands are non-standard. For this reason, a standard
 * PMBus driver can not be used.
 *
 * All Lineage CPL devices have a built-in I2C bus master selector (PCA9541).
 * To ensure device access, this driver should only be used as client driver
 * to the pca9541 I2C master selector driver.
 */

/* Command codes */
#define PEM_OPERATION		0x01
#define PEM_CLEAR_INFO_FLAGS	0x03
#define PEM_VOUT_COMMAND	0x21
#define PEM_VOUT_OV_FAULT_LIMIT	0x40
#define PEM_READ_DATA_STRING	0xd0
#define PEM_READ_INPUT_STRING	0xdc
#define PEM_READ_FIRMWARE_REV	0xdd
#define PEM_READ_RUN_TIMER	0xde
#define PEM_FAN_HI_SPEED	0xdf
#define PEM_FAN_NORMAL_SPEED	0xe0
#define PEM_READ_FAN_SPEED	0xe1

/* offsets in data string */
#define PEM_DATA_STATUS_2	0
#define PEM_DATA_STATUS_1	1
#define PEM_DATA_ALARM_2	2
#define PEM_DATA_ALARM_1	3
#define PEM_DATA_VOUT_LSB	4
#define PEM_DATA_VOUT_MSB	5
#define PEM_DATA_CURRENT	6
#define PEM_DATA_TEMP		7

/* Virtual entries, to report constants */
#define PEM_DATA_TEMP_MAX	10
#define PEM_DATA_TEMP_CRIT	11

/* offsets in input string */
#define PEM_INPUT_VOLTAGE	0
#define PEM_INPUT_POWER_LSB	1
#define PEM_INPUT_POWER_MSB	2

/* offsets in fan data */
#define PEM_FAN_ADJUSTMENT	0
#define PEM_FAN_FAN1		1
#define PEM_FAN_FAN2		2
#define PEM_FAN_FAN3		3

/* Status register bits */
#define STS1_OUTPUT_ON		(1 << 0)
#define STS1_LEDS_FLASHING	(1 << 1)
#define STS1_EXT_FAULT		(1 << 2)
#define STS1_SERVICE_LED_ON	(1 << 3)
#define STS1_SHUTDOWN_OCCURRED	(1 << 4)
#define STS1_INT_FAULT		(1 << 5)
#define STS1_ISOLATION_TEST_OK	(1 << 6)

#define STS2_ENABLE_PIN_HI	(1 << 0)
#define STS2_DATA_OUT_RANGE	(1 << 1)
#define STS2_RESTARTED_OK	(1 << 1)
#define STS2_ISOLATION_TEST_FAIL (1 << 3)
#define STS2_HIGH_POWER_CAP	(1 << 4)
#define STS2_INVALID_INSTR	(1 << 5)
#define STS2_WILL_RESTART	(1 << 6)
#define STS2_PEC_ERR		(1 << 7)

/* Alarm register bits */
#define ALRM1_VIN_OUT_LIMIT	(1 << 0)
#define ALRM1_VOUT_OUT_LIMIT	(1 << 1)
#define ALRM1_OV_VOLT_SHUTDOWN	(1 << 2)
#define ALRM1_VIN_OVERCURRENT	(1 << 3)
#define ALRM1_TEMP_WARNING	(1 << 4)
#define ALRM1_TEMP_SHUTDOWN	(1 << 5)
#define ALRM1_PRIMARY_FAULT	(1 << 6)
#define ALRM1_POWER_LIMIT	(1 << 7)

#define ALRM2_5V_OUT_LIMIT	(1 << 1)
#define ALRM2_TEMP_FAULT	(1 << 2)
#define ALRM2_OV_LOW		(1 << 3)
#define ALRM2_DCDC_TEMP_HIGH	(1 << 4)
#define ALRM2_PRI_TEMP_HIGH	(1 << 5)
#define ALRM2_NO_PRIMARY	(1 << 6)
#define ALRM2_FAN_FAULT		(1 << 7)

#define FIRMWARE_REV_LEN	4
#define DATA_STRING_LEN		9
#define INPUT_STRING_LEN	5	/* 4 for most devices	*/
#define FAN_SPEED_LEN		5

struct pem_data {
	struct device *hwmon_dev;

	struct mutex update_lock;
	bool valid;
	bool fans_supported;
	int input_length;
	unsigned long last_updated;	/* in jiffies */

	u8 firmware_rev[FIRMWARE_REV_LEN];
	u8 data_string[DATA_STRING_LEN];
	u8 input_string[INPUT_STRING_LEN];
	u8 fan_speed[FAN_SPEED_LEN];
};

static int pem_read_block(struct i2c_client *client, u8 command, u8 *data,
			  int data_len)
{
	u8 block_buffer[I2C_SMBUS_BLOCK_MAX];
	int result;

	result = i2c_smbus_read_block_data(client, command, block_buffer);
	if (unlikely(result < 0))
		goto abort;
	if (unlikely(result == 0xff || result != data_len)) {
		result = -EIO;
		goto abort;
	}
	memcpy(data, block_buffer, data_len);
	result = 0;
abort:
	return result;
}

static struct pem_data *pem_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct pem_data *data = i2c_get_clientdata(client);
	struct pem_data *ret = data;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		int result;

		/* Read data string */
		result = pem_read_block(client, PEM_READ_DATA_STRING,
					data->data_string,
					sizeof(data->data_string));
		if (unlikely(result < 0)) {
			ret = ERR_PTR(result);
			goto abort;
		}

		/* Read input string */
		if (data->input_length) {
			result = pem_read_block(client, PEM_READ_INPUT_STRING,
						data->input_string,
						data->input_length);
			if (unlikely(result < 0)) {
				ret = ERR_PTR(result);
				goto abort;
			}
		}

		/* Read fan speeds */
		if (data->fans_supported) {
			result = pem_read_block(client, PEM_READ_FAN_SPEED,
						data->fan_speed,
						sizeof(data->fan_speed));
			if (unlikely(result < 0)) {
				ret = ERR_PTR(result);
				goto abort;
			}
		}

		i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS);

		data->last_updated = jiffies;
		data->valid = 1;
	}
abort:
	mutex_unlock(&data->update_lock);
	return ret;
}

static long pem_get_data(u8 *data, int len, int index)
{
	long val;

	switch (index) {
	case PEM_DATA_VOUT_LSB:
		val = (data[index] + (data[index+1] << 8)) * 5 / 2;
		break;
	case PEM_DATA_CURRENT:
		val = data[index] * 200;
		break;
	case PEM_DATA_TEMP:
		val = data[index] * 1000;
		break;
	case PEM_DATA_TEMP_MAX:
		val = 97 * 1000;	/* 97 degrees C per datasheet */
		break;
	case PEM_DATA_TEMP_CRIT:
		val = 107 * 1000;	/* 107 degrees C per datasheet */
		break;
	default:
		WARN_ON_ONCE(1);
		val = 0;
	}
	return val;
}

static long pem_get_input(u8 *data, int len, int index)
{
	long val;

	switch (index) {
	case PEM_INPUT_VOLTAGE:
		if (len == INPUT_STRING_LEN)
			val = (data[index] + (data[index+1] << 8) - 75) * 1000;
		else
			val = (data[index] - 75) * 1000;
		break;
	case PEM_INPUT_POWER_LSB:
		if (len == INPUT_STRING_LEN)
			index++;
		val = (data[index] + (data[index+1] << 8)) * 1000000L;
		break;
	default:
		WARN_ON_ONCE(1);
		val = 0;
	}
	return val;
}

static long pem_get_fan(u8 *data, int len, int index)
{
	long val;

	switch (index) {
	case PEM_FAN_FAN1:
	case PEM_FAN_FAN2:
	case PEM_FAN_FAN3:
		val = data[index] * 100;
		break;
	default:
		WARN_ON_ONCE(1);
		val = 0;
	}
	return val;
}

/*
 * Show boolean, either a fault or an alarm.
 * .nr points to the register, .index is the bit mask to check
 */
static ssize_t pem_show_bool(struct device *dev,
			     struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
	struct pem_data *data = pem_update_device(dev);
	u8 status;

	if (IS_ERR(data))
		return PTR_ERR(data);

	status = data->data_string[attr->nr] & attr->index;
	return snprintf(buf, PAGE_SIZE, "%d\n", !!status);
}

static ssize_t pem_show_data(struct device *dev, struct device_attribute *da,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct pem_data *data = pem_update_device(dev);
	long value;

	if (IS_ERR(data))
		return PTR_ERR(data);

	value = pem_get_data(data->data_string, sizeof(data->data_string),
			     attr->index);

	return snprintf(buf, PAGE_SIZE, "%ld\n", value);
}

static ssize_t pem_show_input(struct device *dev, struct device_attribute *da,
			      char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct pem_data *data = pem_update_device(dev);
	long value;

	if (IS_ERR(data))
		return PTR_ERR(data);

	value = pem_get_input(data->input_string, sizeof(data->input_string),
			      attr->index);

	return snprintf(buf, PAGE_SIZE, "%ld\n", value);
}

static ssize_t pem_show_fan(struct device *dev, struct device_attribute *da,
			    char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct pem_data *data = pem_update_device(dev);
	long value;

	if (IS_ERR(data))
		return PTR_ERR(data);

	value = pem_get_fan(data->fan_speed, sizeof(data->fan_speed),
			    attr->index);

	return snprintf(buf, PAGE_SIZE, "%ld\n", value);
}

/* Voltages */
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, pem_show_data, NULL,
			  PEM_DATA_VOUT_LSB);
static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, pem_show_bool, NULL,
			    PEM_DATA_ALARM_1, ALRM1_VOUT_OUT_LIMIT);
static SENSOR_DEVICE_ATTR_2(in1_crit_alarm, S_IRUGO, pem_show_bool, NULL,
			    PEM_DATA_ALARM_1, ALRM1_OV_VOLT_SHUTDOWN);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, pem_show_input, NULL,
			  PEM_INPUT_VOLTAGE);
static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, pem_show_bool, NULL,
			    PEM_DATA_ALARM_1,
			    ALRM1_VIN_OUT_LIMIT | ALRM1_PRIMARY_FAULT);

/* Currents */
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, pem_show_data, NULL,
			  PEM_DATA_CURRENT);
static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, pem_show_bool, NULL,
			    PEM_DATA_ALARM_1, ALRM1_VIN_OVERCURRENT);

/* Power */
static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, pem_show_input, NULL,
			  PEM_INPUT_POWER_LSB);
static SENSOR_DEVICE_ATTR_2(power1_alarm, S_IRUGO, pem_show_bool, NULL,
			    PEM_DATA_ALARM_1, ALRM1_POWER_LIMIT);

/* Fans */
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, pem_show_fan, NULL,
			  PEM_FAN_FAN1);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, pem_show_fan, NULL,
			  PEM_FAN_FAN2);
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, pem_show_fan, NULL,
			  PEM_FAN_FAN3);
static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, pem_show_bool, NULL,
			    PEM_DATA_ALARM_2, ALRM2_FAN_FAULT);

/* Temperatures */
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, pem_show_data, NULL,
			  PEM_DATA_TEMP);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, pem_show_data, NULL,
			  PEM_DATA_TEMP_MAX);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, pem_show_data, NULL,
			  PEM_DATA_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_2(temp1_alarm, S_IRUGO, pem_show_bool, NULL,
			    PEM_DATA_ALARM_1, ALRM1_TEMP_WARNING);
static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, pem_show_bool, NULL,
			    PEM_DATA_ALARM_1, ALRM1_TEMP_SHUTDOWN);
static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, pem_show_bool, NULL,
			    PEM_DATA_ALARM_2, ALRM2_TEMP_FAULT);

static struct attribute *pem_attributes[] = {
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_alarm.dev_attr.attr,
	&sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,

	&sensor_dev_attr_curr1_alarm.dev_attr.attr,

	&sensor_dev_attr_power1_alarm.dev_attr.attr,

	&sensor_dev_attr_fan1_alarm.dev_attr.attr,

	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_fault.dev_attr.attr,

	NULL,
};

static const struct attribute_group pem_group = {
	.attrs = pem_attributes,
};

static struct attribute *pem_input_attributes[] = {
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_curr1_input.dev_attr.attr,
	&sensor_dev_attr_power1_input.dev_attr.attr,
	NULL
};

static const struct attribute_group pem_input_group = {
	.attrs = pem_input_attributes,
};

static struct attribute *pem_fan_attributes[] = {
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan3_input.dev_attr.attr,
	NULL
};

static const struct attribute_group pem_fan_group = {
	.attrs = pem_fan_attributes,
};

static int pem_probe(struct i2c_client *client,
		     const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = client->adapter;
	struct pem_data *data;
	int ret;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BLOCK_DATA
				     | I2C_FUNC_SMBUS_WRITE_BYTE))
		return -ENODEV;

	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

	/*
	 * We use the next two commands to determine if the device is really
	 * there.
	 */
	ret = pem_read_block(client, PEM_READ_FIRMWARE_REV,
			     data->firmware_rev, sizeof(data->firmware_rev));
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS);
	if (ret < 0)
		return ret;

	dev_info(&client->dev, "Firmware revision %d.%d.%d\n",
		 data->firmware_rev[0], data->firmware_rev[1],
		 data->firmware_rev[2]);

	/* Register sysfs hooks */
	ret = sysfs_create_group(&client->dev.kobj, &pem_group);
	if (ret)
		return ret;

	/*
	 * Check if input readings are supported.
	 * This is the case if we can read input data,
	 * and if the returned data is not all zeros.
	 * Note that input alarms are always supported.
	 */
	ret = pem_read_block(client, PEM_READ_INPUT_STRING,
			     data->input_string,
			     sizeof(data->input_string) - 1);
	if (!ret && (data->input_string[0] || data->input_string[1] ||
		     data->input_string[2]))
		data->input_length = sizeof(data->input_string) - 1;
	else if (ret < 0) {
		/* Input string is one byte longer for some devices */
		ret = pem_read_block(client, PEM_READ_INPUT_STRING,
				    data->input_string,
				    sizeof(data->input_string));
		if (!ret && (data->input_string[0] || data->input_string[1] ||
			    data->input_string[2] || data->input_string[3]))
			data->input_length = sizeof(data->input_string);
	}
	ret = 0;
	if (data->input_length) {
		ret = sysfs_create_group(&client->dev.kobj, &pem_input_group);
		if (ret)
			goto out_remove_groups;
	}

	/*
	 * Check if fan speed readings are supported.
	 * This is the case if we can read fan speed data,
	 * and if the returned data is not all zeros.
	 * Note that the fan alarm is always supported.
	 */
	ret = pem_read_block(client, PEM_READ_FAN_SPEED,
			     data->fan_speed,
			     sizeof(data->fan_speed));
	if (!ret && (data->fan_speed[0] || data->fan_speed[1] ||
		     data->fan_speed[2] || data->fan_speed[3])) {
		data->fans_supported = true;
		ret = sysfs_create_group(&client->dev.kobj, &pem_fan_group);
		if (ret)
			goto out_remove_groups;
	}

	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		ret = PTR_ERR(data->hwmon_dev);
		goto out_remove_groups;
	}

	return 0;

out_remove_groups:
	sysfs_remove_group(&client->dev.kobj, &pem_input_group);
	sysfs_remove_group(&client->dev.kobj, &pem_fan_group);
	sysfs_remove_group(&client->dev.kobj, &pem_group);
	return ret;
}

static int pem_remove(struct i2c_client *client)
{
	struct pem_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);

	sysfs_remove_group(&client->dev.kobj, &pem_input_group);
	sysfs_remove_group(&client->dev.kobj, &pem_fan_group);
	sysfs_remove_group(&client->dev.kobj, &pem_group);

	return 0;
}

static const struct i2c_device_id pem_id[] = {
	{"lineage_pem", 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, pem_id);

static struct i2c_driver pem_driver = {
	.driver = {
		   .name = "lineage_pem",
		   },
	.probe = pem_probe,
	.remove = pem_remove,
	.id_table = pem_id,
};

module_i2c_driver(pem_driver);

MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("Lineage CPL PEM hardware monitoring driver");
MODULE_LICENSE("GPL");