Edward A. James | 537225b | 2017-05-16 16:05:46 -0500 | [diff] [blame] | 1 | From b3991e27b26930ef46206dad17715d8ac2f38a4e Mon Sep 17 00:00:00 2001 |
| 2 | From: Timothy Pearson <tpearson@raptorengineering.com> |
| 3 | Date: Tue, 11 Oct 2016 09:35:51 -0500 |
| 4 | Subject: [PATCH] hwmon: Add support for MAX31785 intelligent fan controller |
| 5 | |
| 6 | Add a basic driver for the MAX31785, focusing on the fan control |
| 7 | features but ignoring the temperature and voltage monitoring |
| 8 | features of the device. |
| 9 | |
| 10 | This driver supports all fan control modes and tachometer / PWM |
| 11 | readback where applicable. |
| 12 | |
| 13 | Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com> |
| 14 | Signed-off-by: Joel Stanley <joel@jms.id.au> |
| 15 | --- |
| 16 | Documentation/hwmon/max31785 | 36 +++ |
| 17 | drivers/hwmon/Kconfig | 10 + |
| 18 | drivers/hwmon/Makefile | 1 + |
| 19 | drivers/hwmon/max31785.c | 714 +++++++++++++++++++++++++++++++++++++++++++ |
| 20 | 4 files changed, 761 insertions(+) |
| 21 | create mode 100644 Documentation/hwmon/max31785 |
| 22 | create mode 100644 drivers/hwmon/max31785.c |
| 23 | |
| 24 | diff --git a/Documentation/hwmon/max31785 b/Documentation/hwmon/max31785 |
| 25 | new file mode 100644 |
| 26 | index 0000000..0911d20 |
| 27 | --- /dev/null |
| 28 | +++ b/Documentation/hwmon/max31785 |
| 29 | @@ -0,0 +1,36 @@ |
| 30 | +Kernel driver max31785 |
| 31 | +====================== |
| 32 | + |
| 33 | +Supported chips: |
| 34 | + * Maxim MAX31785 |
| 35 | + Prefix: 'max31785' |
| 36 | + Addresses scanned: 0x52 0x53 0x54 0x55 |
| 37 | + Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31785.pdf |
| 38 | + |
| 39 | +Author: Timothy Pearson <tpearson@raptorengineering.com> |
| 40 | + |
| 41 | + |
| 42 | +Description |
| 43 | +----------- |
| 44 | + |
| 45 | +This driver implements support for the Maxim MAX31785 chip. |
| 46 | + |
| 47 | +The MAX31785 controls the speeds of up to six fans using six independent |
| 48 | +PWM outputs. The desired fan speeds (or PWM duty cycles) are written |
| 49 | +through the I2C interface. The outputs drive "4-wire" fans directly, |
| 50 | +or can be used to modulate the fan's power terminals using an external |
| 51 | +pass transistor. |
| 52 | + |
| 53 | +Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%) |
| 54 | +monitoring and control of fan RPM as well as detection of fan failure. |
| 55 | + |
| 56 | + |
| 57 | +Sysfs entries |
| 58 | +------------- |
| 59 | + |
| 60 | +fan[1-6]_input RO fan tachometer speed in RPM |
| 61 | +fan[1-6]_fault RO fan experienced fault |
| 62 | +fan[1-6]_pulses RW tachometer pulses per fan revolution |
| 63 | +fan[1-6]_target RW desired fan speed in RPM |
| 64 | +pwm[1-6]_enable RW pwm mode, 0=disabled, 1=pwm, 2=rpm, 3=automatic |
| 65 | +pwm[1-6] RW fan target duty cycle (0-255) |
| 66 | diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig |
| 67 | index 190d270..136605d 100644 |
| 68 | --- a/drivers/hwmon/Kconfig |
| 69 | +++ b/drivers/hwmon/Kconfig |
| 70 | @@ -886,6 +886,16 @@ config SENSORS_MAX6697 |
| 71 | This driver can also be built as a module. If so, the module |
| 72 | will be called max6697. |
| 73 | |
| 74 | +config SENSORS_MAX31785 |
| 75 | + tristate "Maxim MAX31785 sensor chip" |
| 76 | + depends on I2C |
| 77 | + help |
| 78 | + If you say yes here you get support for 6-Channel PWM-Output |
| 79 | + Fan RPM Controller. |
| 80 | + |
| 81 | + This driver can also be built as a module. If so, the module |
| 82 | + will be called max31785. |
| 83 | + |
| 84 | config SENSORS_MAX31790 |
| 85 | tristate "Maxim MAX31790 sensor chip" |
| 86 | depends on I2C |
| 87 | diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile |
| 88 | index d2cb7e8..e8ba5c6 100644 |
| 89 | --- a/drivers/hwmon/Makefile |
| 90 | +++ b/drivers/hwmon/Makefile |
| 91 | @@ -119,6 +119,7 @@ obj-$(CONFIG_SENSORS_MAX6639) += max6639.o |
| 92 | obj-$(CONFIG_SENSORS_MAX6642) += max6642.o |
| 93 | obj-$(CONFIG_SENSORS_MAX6650) += max6650.o |
| 94 | obj-$(CONFIG_SENSORS_MAX6697) += max6697.o |
| 95 | +obj-$(CONFIG_SENSORS_MAX31785) += max31785.o |
| 96 | obj-$(CONFIG_SENSORS_MAX31790) += max31790.o |
| 97 | obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o |
| 98 | obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o |
| 99 | diff --git a/drivers/hwmon/max31785.c b/drivers/hwmon/max31785.c |
| 100 | new file mode 100644 |
| 101 | index 0000000..fb7b3f0 |
| 102 | --- /dev/null |
| 103 | +++ b/drivers/hwmon/max31785.c |
| 104 | @@ -0,0 +1,714 @@ |
| 105 | +/* |
| 106 | + * max31785.c - Part of lm_sensors, Linux kernel modules for hardware |
| 107 | + * monitoring. |
| 108 | + * |
| 109 | + * (C) 2016 Raptor Engineering, LLC |
| 110 | + * |
| 111 | + * This program is free software; you can redistribute it and/or modify |
| 112 | + * it under the terms of the GNU General Public License as published by |
| 113 | + * the Free Software Foundation; either version 2 of the License, or |
| 114 | + * (at your option) any later version. |
| 115 | + * |
| 116 | + * This program is distributed in the hope that it will be useful, |
| 117 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 118 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 119 | + * GNU General Public License for more details. |
| 120 | + */ |
| 121 | + |
| 122 | +#include <linux/err.h> |
| 123 | +#include <linux/hwmon.h> |
| 124 | +#include <linux/hwmon-sysfs.h> |
| 125 | +#include <linux/i2c.h> |
| 126 | +#include <linux/init.h> |
| 127 | +#include <linux/jiffies.h> |
| 128 | +#include <linux/module.h> |
| 129 | +#include <linux/slab.h> |
| 130 | + |
| 131 | +/* MAX31785 device IDs */ |
| 132 | +#define MAX31785_MFR_ID 0x4d |
| 133 | +#define MAX31785_MFR_MODEL 0x53 |
| 134 | + |
| 135 | +/* MAX31785 registers */ |
| 136 | +#define MAX31785_REG_PAGE 0x00 |
| 137 | +#define MAX31785_PAGE_FAN_CONFIG(ch) (0x00 + (ch)) |
| 138 | +#define MAX31785_REG_FAN_CONFIG_1_2 0x3a |
| 139 | +#define MAX31785_REG_FAN_COMMAND_1 0x3b |
| 140 | +#define MAX31785_REG_STATUS_FANS_1_2 0x81 |
| 141 | +#define MAX31785_REG_FAN_SPEED_1 0x90 |
| 142 | +#define MAX31785_REG_MFR_ID 0x99 |
| 143 | +#define MAX31785_REG_MFR_MODEL 0x9a |
| 144 | +#define MAX31785_REG_MFR_FAN_CONFIG 0xf1 |
| 145 | +#define MAX31785_REG_READ_FAN_PWM 0xf3 |
| 146 | + |
| 147 | +/* Fan Config register bits */ |
| 148 | +#define MAX31785_FAN_CFG_PWM_ENABLE 0x80 |
| 149 | +#define MAX31785_FAN_CFG_CONTROL_MODE_RPM 0x40 |
| 150 | +#define MAX31785_FAN_CFG_PULSE_MASK 0x30 |
| 151 | +#define MAX31785_FAN_CFG_PULSE_SHIFT 4 |
| 152 | +#define MAX31785_FAN_CFG_PULSE_OFFSET 1 |
| 153 | + |
| 154 | +/* Fan Status register bits */ |
| 155 | +#define MAX31785_FAN_STATUS_FAULT_MASK 0x80 |
| 156 | + |
| 157 | +/* Fan Command constants */ |
| 158 | +#define MAX31785_FAN_COMMAND_PWM_RATIO 40 |
| 159 | + |
| 160 | +#define NR_CHANNEL 6 |
| 161 | + |
| 162 | +/* Addresses to scan */ |
| 163 | +static const unsigned short normal_i2c[] = { 0x52, 0x53, 0x54, 0x55, |
| 164 | + I2C_CLIENT_END }; |
| 165 | + |
| 166 | +/* |
| 167 | + * Client data (each client gets its own) |
| 168 | + */ |
| 169 | +struct max31785_data { |
| 170 | + struct i2c_client *client; |
| 171 | + struct mutex device_lock; |
| 172 | + bool valid; /* zero until following fields are valid */ |
| 173 | + unsigned long last_updated; /* in jiffies */ |
| 174 | + |
| 175 | + /* register values */ |
| 176 | + u8 fan_config[NR_CHANNEL]; |
| 177 | + u16 fan_command[NR_CHANNEL]; |
| 178 | + u8 mfr_fan_config[NR_CHANNEL]; |
| 179 | + u8 fault_status[NR_CHANNEL]; |
| 180 | + u16 tach_rpm[NR_CHANNEL]; |
| 181 | + u16 pwm[NR_CHANNEL]; |
| 182 | +}; |
| 183 | + |
| 184 | +static int max31785_set_page(struct i2c_client *client, |
| 185 | + u8 page) |
| 186 | +{ |
| 187 | + return i2c_smbus_write_byte_data(client, |
| 188 | + MAX31785_REG_PAGE, |
| 189 | + page); |
| 190 | +} |
| 191 | + |
| 192 | +static int max31785_read_fan_data(struct i2c_client *client, |
| 193 | + u8 fan, u8 reg, u8 byte_mode) |
| 194 | +{ |
| 195 | + int rv; |
| 196 | + |
| 197 | + rv = max31785_set_page(client, MAX31785_PAGE_FAN_CONFIG(fan)); |
| 198 | + if (rv < 0) |
| 199 | + return rv; |
| 200 | + |
| 201 | + if (byte_mode) |
| 202 | + rv = i2c_smbus_read_byte_data(client, reg); |
| 203 | + else |
| 204 | + rv = i2c_smbus_read_word_data(client, reg); |
| 205 | + |
| 206 | + return rv; |
| 207 | +} |
| 208 | + |
| 209 | +static int max31785_write_fan_data(struct i2c_client *client, |
| 210 | + u8 fan, u8 reg, u16 data, |
| 211 | + u8 byte_mode) |
| 212 | +{ |
| 213 | + int err; |
| 214 | + |
| 215 | + err = max31785_set_page(client, MAX31785_PAGE_FAN_CONFIG(fan)); |
| 216 | + if (err < 0) |
| 217 | + return err; |
| 218 | + |
| 219 | + if (byte_mode) |
| 220 | + err = i2c_smbus_write_byte_data(client, reg, data); |
| 221 | + else |
| 222 | + err = i2c_smbus_write_word_data(client, reg, data); |
| 223 | + |
| 224 | + if (err < 0) |
| 225 | + return err; |
| 226 | + |
| 227 | + return 0; |
| 228 | +} |
| 229 | + |
| 230 | +static bool is_automatic_control_mode(struct max31785_data *data, |
| 231 | + int index) |
| 232 | +{ |
| 233 | + if (data->fan_command[index] > 0x7fff) |
| 234 | + return true; |
| 235 | + else |
| 236 | + return false; |
| 237 | +} |
| 238 | + |
| 239 | +static struct max31785_data *max31785_update_device(struct device *dev) |
| 240 | +{ |
| 241 | + struct max31785_data *data = dev_get_drvdata(dev); |
| 242 | + struct i2c_client *client = data->client; |
| 243 | + struct max31785_data *ret = data; |
| 244 | + int i; |
| 245 | + int rv; |
| 246 | + |
| 247 | + mutex_lock(&data->device_lock); |
| 248 | + |
| 249 | + if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
| 250 | + for (i = 0; i < NR_CHANNEL; i++) { |
| 251 | + rv = max31785_read_fan_data(client, i, |
| 252 | + MAX31785_REG_STATUS_FANS_1_2, 1); |
| 253 | + if (rv < 0) |
| 254 | + goto abort; |
| 255 | + data->fault_status[i] = rv; |
| 256 | + |
| 257 | + rv = max31785_read_fan_data(client, i, |
| 258 | + MAX31785_REG_FAN_SPEED_1, 0); |
| 259 | + if (rv < 0) |
| 260 | + goto abort; |
| 261 | + data->tach_rpm[i] = rv; |
| 262 | + |
| 263 | + if ((data->fan_config[i] |
| 264 | + & MAX31785_FAN_CFG_CONTROL_MODE_RPM) |
| 265 | + || is_automatic_control_mode(data, i)) { |
| 266 | + rv = max31785_read_fan_data(client, i, |
| 267 | + MAX31785_REG_READ_FAN_PWM, 0); |
| 268 | + if (rv < 0) |
| 269 | + goto abort; |
| 270 | + data->pwm[i] = rv; |
| 271 | + } |
| 272 | + |
| 273 | + if (!is_automatic_control_mode(data, i)) { |
| 274 | + /* Poke watchdog for manual fan control */ |
| 275 | + rv = max31785_write_fan_data(client, |
| 276 | + i, MAX31785_REG_FAN_COMMAND_1, |
| 277 | + data->fan_command[i], 0); |
| 278 | + if (rv < 0) |
| 279 | + goto abort; |
| 280 | + } |
| 281 | + } |
| 282 | + |
| 283 | + data->last_updated = jiffies; |
| 284 | + data->valid = true; |
| 285 | + } |
| 286 | + goto done; |
| 287 | + |
| 288 | +abort: |
| 289 | + data->valid = false; |
| 290 | + ret = ERR_PTR(rv); |
| 291 | + |
| 292 | +done: |
| 293 | + mutex_unlock(&data->device_lock); |
| 294 | + |
| 295 | + return ret; |
| 296 | +} |
| 297 | + |
| 298 | +static ssize_t get_fan(struct device *dev, |
| 299 | + struct device_attribute *devattr, char *buf) |
| 300 | +{ |
| 301 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 302 | + struct max31785_data *data = max31785_update_device(dev); |
| 303 | + |
| 304 | + if (IS_ERR(data)) |
| 305 | + return PTR_ERR(data); |
| 306 | + |
| 307 | + return sprintf(buf, "%d\n", data->tach_rpm[attr->index]); |
| 308 | +} |
| 309 | + |
| 310 | +static ssize_t get_fan_target(struct device *dev, |
| 311 | + struct device_attribute *devattr, char *buf) |
| 312 | +{ |
| 313 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 314 | + struct max31785_data *data = max31785_update_device(dev); |
| 315 | + int rpm; |
| 316 | + |
| 317 | + if (IS_ERR(data)) |
| 318 | + return PTR_ERR(data); |
| 319 | + |
| 320 | + if (data->fan_config[attr->index] |
| 321 | + & MAX31785_FAN_CFG_CONTROL_MODE_RPM) |
| 322 | + rpm = data->fan_command[attr->index]; |
| 323 | + else |
| 324 | + rpm = data->fan_command[attr->index] |
| 325 | + / MAX31785_FAN_COMMAND_PWM_RATIO; |
| 326 | + |
| 327 | + return sprintf(buf, "%d\n", rpm); |
| 328 | +} |
| 329 | + |
| 330 | +static ssize_t set_fan_target(struct device *dev, |
| 331 | + struct device_attribute *devattr, |
| 332 | + const char *buf, size_t count) |
| 333 | +{ |
| 334 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 335 | + struct max31785_data *data = dev_get_drvdata(dev); |
| 336 | + struct i2c_client *client = data->client; |
| 337 | + unsigned long rpm; |
| 338 | + int err; |
| 339 | + |
| 340 | + err = kstrtoul(buf, 10, &rpm); |
| 341 | + if (err) |
| 342 | + return err; |
| 343 | + |
| 344 | + if (rpm > 0x7fff) |
| 345 | + return -EINVAL; |
| 346 | + |
| 347 | + mutex_lock(&data->device_lock); |
| 348 | + |
| 349 | + /* Write new RPM value */ |
| 350 | + data->fan_command[attr->index] = rpm; |
| 351 | + err = max31785_write_fan_data(client, attr->index, |
| 352 | + MAX31785_REG_FAN_COMMAND_1, |
| 353 | + data->fan_command[attr->index], 0); |
| 354 | + |
| 355 | + mutex_unlock(&data->device_lock); |
| 356 | + |
| 357 | + if (err < 0) |
| 358 | + return err; |
| 359 | + |
| 360 | + return count; |
| 361 | +} |
| 362 | + |
| 363 | +static ssize_t get_fan_pulses(struct device *dev, |
| 364 | + struct device_attribute *devattr, char *buf) |
| 365 | +{ |
| 366 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 367 | + struct max31785_data *data = max31785_update_device(dev); |
| 368 | + int pulses; |
| 369 | + |
| 370 | + if (IS_ERR(data)) |
| 371 | + return PTR_ERR(data); |
| 372 | + |
| 373 | + pulses = ((data->fan_config[attr->index] & MAX31785_FAN_CFG_PULSE_MASK) |
| 374 | + >> MAX31785_FAN_CFG_PULSE_SHIFT) |
| 375 | + + MAX31785_FAN_CFG_PULSE_OFFSET; |
| 376 | + |
| 377 | + return sprintf(buf, "%d\n", pulses); |
| 378 | +} |
| 379 | + |
| 380 | +static ssize_t set_fan_pulses(struct device *dev, |
| 381 | + struct device_attribute *devattr, |
| 382 | + const char *buf, size_t count) |
| 383 | +{ |
| 384 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 385 | + struct max31785_data *data = dev_get_drvdata(dev); |
| 386 | + struct i2c_client *client = data->client; |
| 387 | + unsigned long pulses; |
| 388 | + int err; |
| 389 | + |
| 390 | + err = kstrtoul(buf, 10, &pulses); |
| 391 | + if (err) |
| 392 | + return err; |
| 393 | + |
| 394 | + if (pulses > 4) |
| 395 | + return -EINVAL; |
| 396 | + |
| 397 | + data->fan_config[attr->index] &= MAX31785_FAN_CFG_PULSE_MASK; |
| 398 | + data->fan_config[attr->index] |= |
| 399 | + ((pulses - MAX31785_FAN_CFG_PULSE_OFFSET) |
| 400 | + << MAX31785_FAN_CFG_PULSE_SHIFT); |
| 401 | + |
| 402 | + mutex_lock(&data->device_lock); |
| 403 | + |
| 404 | + /* Write new pulse value */ |
| 405 | + data->fan_command[attr->index] = pulses; |
| 406 | + err = max31785_write_fan_data(client, attr->index, |
| 407 | + MAX31785_REG_FAN_CONFIG_1_2, |
| 408 | + data->fan_config[attr->index], 1); |
| 409 | + |
| 410 | + mutex_unlock(&data->device_lock); |
| 411 | + |
| 412 | + if (err < 0) |
| 413 | + return err; |
| 414 | + |
| 415 | + return count; |
| 416 | +} |
| 417 | + |
| 418 | +static ssize_t get_pwm(struct device *dev, |
| 419 | + struct device_attribute *devattr, char *buf) |
| 420 | +{ |
| 421 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 422 | + struct max31785_data *data = max31785_update_device(dev); |
| 423 | + int pwm; |
| 424 | + |
| 425 | + if (IS_ERR(data)) |
| 426 | + return PTR_ERR(data); |
| 427 | + |
| 428 | + if ((data->fan_config[attr->index] |
| 429 | + & MAX31785_FAN_CFG_CONTROL_MODE_RPM) |
| 430 | + || is_automatic_control_mode(data, attr->index)) |
| 431 | + pwm = data->pwm[attr->index] / 100; |
| 432 | + else |
| 433 | + pwm = data->fan_command[attr->index] |
| 434 | + / MAX31785_FAN_COMMAND_PWM_RATIO; |
| 435 | + |
| 436 | + return sprintf(buf, "%d\n", pwm); |
| 437 | +} |
| 438 | + |
| 439 | +static ssize_t set_pwm(struct device *dev, |
| 440 | + struct device_attribute *devattr, |
| 441 | + const char *buf, size_t count) |
| 442 | +{ |
| 443 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 444 | + struct max31785_data *data = dev_get_drvdata(dev); |
| 445 | + struct i2c_client *client = data->client; |
| 446 | + unsigned long pwm; |
| 447 | + int err; |
| 448 | + |
| 449 | + err = kstrtoul(buf, 10, &pwm); |
| 450 | + if (err) |
| 451 | + return err; |
| 452 | + |
| 453 | + if (pwm > 255) |
| 454 | + return -EINVAL; |
| 455 | + |
| 456 | + mutex_lock(&data->device_lock); |
| 457 | + |
| 458 | + /* Write new PWM value */ |
| 459 | + data->fan_command[attr->index] = pwm * MAX31785_FAN_COMMAND_PWM_RATIO; |
| 460 | + err = max31785_write_fan_data(client, attr->index, |
| 461 | + MAX31785_REG_FAN_COMMAND_1, |
| 462 | + data->fan_command[attr->index], 0); |
| 463 | + |
| 464 | + mutex_unlock(&data->device_lock); |
| 465 | + |
| 466 | + if (err < 0) |
| 467 | + return err; |
| 468 | + |
| 469 | + return count; |
| 470 | +} |
| 471 | + |
| 472 | +static ssize_t get_pwm_enable(struct device *dev, |
| 473 | + struct device_attribute *devattr, char *buf) |
| 474 | +{ |
| 475 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 476 | + struct max31785_data *data = max31785_update_device(dev); |
| 477 | + int mode; |
| 478 | + |
| 479 | + if (IS_ERR(data)) |
| 480 | + return PTR_ERR(data); |
| 481 | + |
| 482 | + if (!(data->fan_config[attr->index] & MAX31785_FAN_CFG_PWM_ENABLE)) |
| 483 | + mode = 0; |
| 484 | + else if (is_automatic_control_mode(data, attr->index)) |
| 485 | + mode = 3; |
| 486 | + else if (data->fan_config[attr->index] |
| 487 | + & MAX31785_FAN_CFG_CONTROL_MODE_RPM) |
| 488 | + mode = 2; |
| 489 | + else |
| 490 | + mode = 1; |
| 491 | + |
| 492 | + return sprintf(buf, "%d\n", mode); |
| 493 | +} |
| 494 | + |
| 495 | +static ssize_t set_pwm_enable(struct device *dev, |
| 496 | + struct device_attribute *devattr, |
| 497 | + const char *buf, size_t count) |
| 498 | +{ |
| 499 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 500 | + struct max31785_data *data = dev_get_drvdata(dev); |
| 501 | + struct i2c_client *client = data->client; |
| 502 | + unsigned long mode; |
| 503 | + int err; |
| 504 | + |
| 505 | + err = kstrtoul(buf, 10, &mode); |
| 506 | + if (err) |
| 507 | + return err; |
| 508 | + |
| 509 | + switch (mode) { |
| 510 | + case 0: |
| 511 | + data->fan_config[attr->index] = |
| 512 | + data->fan_config[attr->index] |
| 513 | + & ~MAX31785_FAN_CFG_PWM_ENABLE; |
| 514 | + break; |
| 515 | + case 1: |
| 516 | + case 2: |
| 517 | + case 3: |
| 518 | + data->fan_config[attr->index] = |
| 519 | + data->fan_config[attr->index] |
| 520 | + | MAX31785_FAN_CFG_PWM_ENABLE; |
| 521 | + break; |
| 522 | + default: |
| 523 | + return -EINVAL; |
| 524 | + } |
| 525 | + |
| 526 | + switch (mode) { |
| 527 | + case 0: |
| 528 | + break; |
| 529 | + case 1: |
| 530 | + data->fan_config[attr->index] = |
| 531 | + data->fan_config[attr->index] |
| 532 | + & ~MAX31785_FAN_CFG_CONTROL_MODE_RPM; |
| 533 | + break; |
| 534 | + case 2: |
| 535 | + data->fan_config[attr->index] = |
| 536 | + data->fan_config[attr->index] |
| 537 | + | MAX31785_FAN_CFG_CONTROL_MODE_RPM; |
| 538 | + break; |
| 539 | + case 3: |
| 540 | + data->fan_command[attr->index] = 0xffff; |
| 541 | + break; |
| 542 | + default: |
| 543 | + return -EINVAL; |
| 544 | + } |
| 545 | + |
| 546 | + mutex_lock(&data->device_lock); |
| 547 | + |
| 548 | + err = max31785_write_fan_data(client, attr->index, |
| 549 | + MAX31785_REG_FAN_CONFIG_1_2, |
| 550 | + data->fan_config[attr->index], 1); |
| 551 | + |
| 552 | + if (err < 0) |
| 553 | + goto abort; |
| 554 | + |
| 555 | + err = max31785_write_fan_data(client, attr->index, |
| 556 | + MAX31785_REG_FAN_COMMAND_1, |
| 557 | + data->fan_command[attr->index], 0); |
| 558 | + |
| 559 | +abort: |
| 560 | + mutex_unlock(&data->device_lock); |
| 561 | + |
| 562 | + if (err < 0) |
| 563 | + return err; |
| 564 | + |
| 565 | + return count; |
| 566 | +} |
| 567 | + |
| 568 | +static ssize_t get_fan_fault(struct device *dev, |
| 569 | + struct device_attribute *devattr, char *buf) |
| 570 | +{ |
| 571 | + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 572 | + struct max31785_data *data = max31785_update_device(dev); |
| 573 | + int fault; |
| 574 | + |
| 575 | + if (IS_ERR(data)) |
| 576 | + return PTR_ERR(data); |
| 577 | + |
| 578 | + fault = !!(data->fault_status[attr->index] |
| 579 | + & MAX31785_FAN_STATUS_FAULT_MASK); |
| 580 | + |
| 581 | + return sprintf(buf, "%d\n", fault); |
| 582 | +} |
| 583 | + |
| 584 | +static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0); |
| 585 | +static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1); |
| 586 | +static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2); |
| 587 | +static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3); |
| 588 | +static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, get_fan, NULL, 4); |
| 589 | +static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, get_fan, NULL, 5); |
| 590 | + |
| 591 | +static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_fault, NULL, 0); |
| 592 | +static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, get_fan_fault, NULL, 1); |
| 593 | +static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, get_fan_fault, NULL, 2); |
| 594 | +static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, get_fan_fault, NULL, 3); |
| 595 | +static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, get_fan_fault, NULL, 4); |
| 596 | +static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, get_fan_fault, NULL, 5); |
| 597 | + |
| 598 | +static SENSOR_DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, |
| 599 | + get_fan_target, set_fan_target, 0); |
| 600 | +static SENSOR_DEVICE_ATTR(fan2_target, S_IWUSR | S_IRUGO, |
| 601 | + get_fan_target, set_fan_target, 1); |
| 602 | +static SENSOR_DEVICE_ATTR(fan3_target, S_IWUSR | S_IRUGO, |
| 603 | + get_fan_target, set_fan_target, 2); |
| 604 | +static SENSOR_DEVICE_ATTR(fan4_target, S_IWUSR | S_IRUGO, |
| 605 | + get_fan_target, set_fan_target, 3); |
| 606 | +static SENSOR_DEVICE_ATTR(fan5_target, S_IWUSR | S_IRUGO, |
| 607 | + get_fan_target, set_fan_target, 4); |
| 608 | +static SENSOR_DEVICE_ATTR(fan6_target, S_IWUSR | S_IRUGO, |
| 609 | + get_fan_target, set_fan_target, 5); |
| 610 | + |
| 611 | +static SENSOR_DEVICE_ATTR(fan1_pulses, S_IWUSR | S_IRUGO, |
| 612 | + get_fan_pulses, set_fan_pulses, 0); |
| 613 | +static SENSOR_DEVICE_ATTR(fan2_pulses, S_IWUSR | S_IRUGO, |
| 614 | + get_fan_pulses, set_fan_pulses, 1); |
| 615 | +static SENSOR_DEVICE_ATTR(fan3_pulses, S_IWUSR | S_IRUGO, |
| 616 | + get_fan_pulses, set_fan_pulses, 2); |
| 617 | +static SENSOR_DEVICE_ATTR(fan4_pulses, S_IWUSR | S_IRUGO, |
| 618 | + get_fan_pulses, set_fan_pulses, 3); |
| 619 | +static SENSOR_DEVICE_ATTR(fan5_pulses, S_IWUSR | S_IRUGO, |
| 620 | + get_fan_pulses, set_fan_pulses, 4); |
| 621 | +static SENSOR_DEVICE_ATTR(fan6_pulses, S_IWUSR | S_IRUGO, |
| 622 | + get_fan_pulses, set_fan_pulses, 5); |
| 623 | + |
| 624 | +static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 0); |
| 625 | +static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 1); |
| 626 | +static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 2); |
| 627 | +static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 3); |
| 628 | +static SENSOR_DEVICE_ATTR(pwm5, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 4); |
| 629 | +static SENSOR_DEVICE_ATTR(pwm6, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 5); |
| 630 | + |
| 631 | +static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, |
| 632 | + get_pwm_enable, set_pwm_enable, 0); |
| 633 | +static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, |
| 634 | + get_pwm_enable, set_pwm_enable, 1); |
| 635 | +static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO, |
| 636 | + get_pwm_enable, set_pwm_enable, 2); |
| 637 | +static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO, |
| 638 | + get_pwm_enable, set_pwm_enable, 3); |
| 639 | +static SENSOR_DEVICE_ATTR(pwm5_enable, S_IWUSR | S_IRUGO, |
| 640 | + get_pwm_enable, set_pwm_enable, 4); |
| 641 | +static SENSOR_DEVICE_ATTR(pwm6_enable, S_IWUSR | S_IRUGO, |
| 642 | + get_pwm_enable, set_pwm_enable, 5); |
| 643 | + |
| 644 | +static struct attribute *max31785_attrs[] = { |
| 645 | + &sensor_dev_attr_fan1_input.dev_attr.attr, |
| 646 | + &sensor_dev_attr_fan2_input.dev_attr.attr, |
| 647 | + &sensor_dev_attr_fan3_input.dev_attr.attr, |
| 648 | + &sensor_dev_attr_fan4_input.dev_attr.attr, |
| 649 | + &sensor_dev_attr_fan5_input.dev_attr.attr, |
| 650 | + &sensor_dev_attr_fan6_input.dev_attr.attr, |
| 651 | + |
| 652 | + &sensor_dev_attr_fan1_fault.dev_attr.attr, |
| 653 | + &sensor_dev_attr_fan2_fault.dev_attr.attr, |
| 654 | + &sensor_dev_attr_fan3_fault.dev_attr.attr, |
| 655 | + &sensor_dev_attr_fan4_fault.dev_attr.attr, |
| 656 | + &sensor_dev_attr_fan5_fault.dev_attr.attr, |
| 657 | + &sensor_dev_attr_fan6_fault.dev_attr.attr, |
| 658 | + |
| 659 | + &sensor_dev_attr_fan1_target.dev_attr.attr, |
| 660 | + &sensor_dev_attr_fan2_target.dev_attr.attr, |
| 661 | + &sensor_dev_attr_fan3_target.dev_attr.attr, |
| 662 | + &sensor_dev_attr_fan4_target.dev_attr.attr, |
| 663 | + &sensor_dev_attr_fan5_target.dev_attr.attr, |
| 664 | + &sensor_dev_attr_fan6_target.dev_attr.attr, |
| 665 | + |
| 666 | + &sensor_dev_attr_fan1_pulses.dev_attr.attr, |
| 667 | + &sensor_dev_attr_fan2_pulses.dev_attr.attr, |
| 668 | + &sensor_dev_attr_fan3_pulses.dev_attr.attr, |
| 669 | + &sensor_dev_attr_fan4_pulses.dev_attr.attr, |
| 670 | + &sensor_dev_attr_fan5_pulses.dev_attr.attr, |
| 671 | + &sensor_dev_attr_fan6_pulses.dev_attr.attr, |
| 672 | + |
| 673 | + &sensor_dev_attr_pwm1.dev_attr.attr, |
| 674 | + &sensor_dev_attr_pwm2.dev_attr.attr, |
| 675 | + &sensor_dev_attr_pwm3.dev_attr.attr, |
| 676 | + &sensor_dev_attr_pwm4.dev_attr.attr, |
| 677 | + &sensor_dev_attr_pwm5.dev_attr.attr, |
| 678 | + &sensor_dev_attr_pwm6.dev_attr.attr, |
| 679 | + |
| 680 | + &sensor_dev_attr_pwm1_enable.dev_attr.attr, |
| 681 | + &sensor_dev_attr_pwm2_enable.dev_attr.attr, |
| 682 | + &sensor_dev_attr_pwm3_enable.dev_attr.attr, |
| 683 | + &sensor_dev_attr_pwm4_enable.dev_attr.attr, |
| 684 | + &sensor_dev_attr_pwm5_enable.dev_attr.attr, |
| 685 | + &sensor_dev_attr_pwm6_enable.dev_attr.attr, |
| 686 | + NULL |
| 687 | +}; |
| 688 | + |
| 689 | +static umode_t max31785_attrs_visible(struct kobject *kobj, |
| 690 | + struct attribute *a, int n) |
| 691 | +{ |
| 692 | + return a->mode; |
| 693 | +} |
| 694 | + |
| 695 | +static const struct attribute_group max31785_group = { |
| 696 | + .attrs = max31785_attrs, |
| 697 | + .is_visible = max31785_attrs_visible, |
| 698 | +}; |
| 699 | +__ATTRIBUTE_GROUPS(max31785); |
| 700 | + |
| 701 | +static int max31785_init_client(struct i2c_client *client, |
| 702 | + struct max31785_data *data) |
| 703 | +{ |
| 704 | + int i, rv; |
| 705 | + |
| 706 | + for (i = 0; i < NR_CHANNEL; i++) { |
| 707 | + rv = max31785_read_fan_data(client, i, |
| 708 | + MAX31785_REG_FAN_CONFIG_1_2, 1); |
| 709 | + if (rv < 0) |
| 710 | + return rv; |
| 711 | + data->fan_config[i] = rv; |
| 712 | + |
| 713 | + rv = max31785_read_fan_data(client, i, |
| 714 | + MAX31785_REG_FAN_COMMAND_1, 0); |
| 715 | + if (rv < 0) |
| 716 | + return rv; |
| 717 | + data->fan_command[i] = rv; |
| 718 | + |
| 719 | + rv = max31785_read_fan_data(client, i, |
| 720 | + MAX31785_REG_MFR_FAN_CONFIG, 1); |
| 721 | + if (rv < 0) |
| 722 | + return rv; |
| 723 | + data->mfr_fan_config[i] = rv; |
| 724 | + |
| 725 | + if (!((data->fan_config[i] |
| 726 | + & MAX31785_FAN_CFG_CONTROL_MODE_RPM) |
| 727 | + || is_automatic_control_mode(data, i))) { |
| 728 | + data->pwm[i] = 0; |
| 729 | + } |
| 730 | + } |
| 731 | + |
| 732 | + return rv; |
| 733 | +} |
| 734 | + |
| 735 | +/* Return 0 if detection is successful, -ENODEV otherwise */ |
| 736 | +static int max31785_detect(struct i2c_client *client, |
| 737 | + struct i2c_board_info *info) |
| 738 | +{ |
| 739 | + struct i2c_adapter *adapter = client->adapter; |
| 740 | + int rv; |
| 741 | + |
| 742 | + if (!i2c_check_functionality(adapter, |
| 743 | + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) |
| 744 | + return -ENODEV; |
| 745 | + |
| 746 | + /* Probe manufacturer / model registers */ |
| 747 | + rv = i2c_smbus_read_byte_data(client, MAX31785_REG_MFR_ID); |
| 748 | + if (rv < 0) |
| 749 | + return -ENODEV; |
| 750 | + if (rv != MAX31785_MFR_ID) |
| 751 | + return -ENODEV; |
| 752 | + |
| 753 | + rv = i2c_smbus_read_byte_data(client, MAX31785_REG_MFR_MODEL); |
| 754 | + if (rv < 0) |
| 755 | + return -ENODEV; |
| 756 | + if (rv != MAX31785_MFR_MODEL) |
| 757 | + return -ENODEV; |
| 758 | + |
| 759 | + strlcpy(info->type, "max31785", I2C_NAME_SIZE); |
| 760 | + |
| 761 | + return 0; |
| 762 | +} |
| 763 | + |
| 764 | +static int max31785_probe(struct i2c_client *client, |
| 765 | + const struct i2c_device_id *id) |
| 766 | +{ |
| 767 | + struct i2c_adapter *adapter = client->adapter; |
| 768 | + struct device *dev = &client->dev; |
| 769 | + struct max31785_data *data; |
| 770 | + struct device *hwmon_dev; |
| 771 | + int err; |
| 772 | + |
| 773 | + if (!i2c_check_functionality(adapter, |
| 774 | + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) |
| 775 | + return -ENODEV; |
| 776 | + |
| 777 | + data = devm_kzalloc(dev, sizeof(struct max31785_data), GFP_KERNEL); |
| 778 | + if (!data) |
| 779 | + return -ENOMEM; |
| 780 | + |
| 781 | + data->client = client; |
| 782 | + mutex_init(&data->device_lock); |
| 783 | + |
| 784 | + /* |
| 785 | + * Initialize the max31785 chip |
| 786 | + */ |
| 787 | + err = max31785_init_client(client, data); |
| 788 | + if (err) |
| 789 | + return err; |
| 790 | + |
| 791 | + hwmon_dev = devm_hwmon_device_register_with_groups(dev, |
| 792 | + client->name, data, max31785_groups); |
| 793 | + |
| 794 | + return PTR_ERR_OR_ZERO(hwmon_dev); |
| 795 | +} |
| 796 | + |
| 797 | +static const struct i2c_device_id max31785_id[] = { |
| 798 | + { "max31785", 0 }, |
| 799 | + { } |
| 800 | +}; |
| 801 | +MODULE_DEVICE_TABLE(i2c, max31785_id); |
| 802 | + |
| 803 | +static struct i2c_driver max31785_driver = { |
| 804 | + .class = I2C_CLASS_HWMON, |
| 805 | + .probe = max31785_probe, |
| 806 | + .driver = { |
| 807 | + .name = "max31785", |
| 808 | + }, |
| 809 | + .id_table = max31785_id, |
| 810 | + .detect = max31785_detect, |
| 811 | + .address_list = normal_i2c, |
| 812 | +}; |
| 813 | + |
| 814 | +module_i2c_driver(max31785_driver); |
| 815 | + |
| 816 | +MODULE_AUTHOR("Timothy Pearson <tpearson@raptorengineering.com>"); |
| 817 | +MODULE_DESCRIPTION("MAX31785 sensor driver"); |
| 818 | +MODULE_LICENSE("GPL"); |
| 819 | -- |
| 820 | 1.8.3.1 |
| 821 | |