target/linux/brcm2708/patches-3.14/0015-Added-hwmon-thermal-driver-for-reporting-core-temper.patch

   1 From 22964c3b89f28e0957965aee59e713670d3a7729 Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Tue, 26 Mar 2013 19:24:24 +0000
   4 Subject: [PATCH 15/54] Added hwmon/thermal driver for reporting core
   5  temperature. Thanks Dorian
   6
   7 ---
   8  arch/arm/mach-bcm2708/bcm2708.c   |  11 ++
   9  drivers/hwmon/Kconfig             |  10 ++
  10  drivers/hwmon/Makefile            |   1 +
  11  drivers/hwmon/bcm2835-hwmon.c     | 219 ++++++++++++++++++++++++++++++++++++++
  12  drivers/thermal/Kconfig           |   6 ++
  13  drivers/thermal/Makefile          |   1 +
  14  drivers/thermal/bcm2835-thermal.c | 184 ++++++++++++++++++++++++++++++++
  15  7 files changed, 432 insertions(+)
  16  create mode 100644 drivers/hwmon/bcm2835-hwmon.c
  17  create mode 100644 drivers/thermal/bcm2835-thermal.c
  18
  19 --- a/arch/arm/mach-bcm2708/bcm2708.c
  20 +++ b/arch/arm/mach-bcm2708/bcm2708.c
  21 @@ -483,6 +483,14 @@ static struct platform_device bcm2708_al
  22                },
  23  };
  24
  25 +static struct platform_device bcm2835_hwmon_device = {
  26 +       .name = "bcm2835_hwmon",
  27 +};
  28 +
  29 +static struct platform_device bcm2835_thermal_device = {
  30 +       .name = "bcm2835_thermal",
  31 +};
  32 +
  33  int __init bcm_register_device(struct platform_device *pdev)
  34  {
  35         int ret;
  36 @@ -594,6 +602,9 @@ void __init bcm2708_init(void)
  37         for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
  38                 bcm_register_device(&bcm2708_alsa_devices[i]);
  39
  40 +       bcm_register_device(&bcm2835_hwmon_device);
  41 +       bcm_register_device(&bcm2835_thermal_device);
  42 +
  43         for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
  44                 struct amba_device *d = amba_devs[i];
  45                 amba_device_register(d, &iomem_resource);
  46 --- a/drivers/hwmon/Kconfig
  47 +++ b/drivers/hwmon/Kconfig
  48 @@ -1565,6 +1565,16 @@ config SENSORS_MC13783_ADC
  49          help
  50            Support for the A/D converter on MC13783 and MC13892 PMIC.
  51
  52 +config SENSORS_BCM2835
  53 +       depends on THERMAL_BCM2835=n
  54 +       tristate "Broadcom BCM2835 HWMON Driver"
  55 +       help
  56 +         If you say yes here you get support for the hardware
  57 +         monitoring features of the BCM2835 Chip
  58 +
  59 +         This driver can also be built as a module.  If so, the module
  60 +         will be called bcm2835-hwmon.
  61 +
  62  if ACPI
  63
  64  comment "ACPI drivers"
  65 --- /dev/null
  66 +++ b/drivers/hwmon/bcm2835-hwmon.c
  67 @@ -0,0 +1,219 @@
  68 +/*****************************************************************************
  69 +* Copyright 2011 Broadcom Corporation.  All rights reserved.
  70 +*
  71 +* Unless you and Broadcom execute a separate written software license
  72 +* agreement governing use of this software, this software is licensed to you
  73 +* under the terms of the GNU General Public License version 2, available at
  74 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
  75 +*
  76 +* Notwithstanding the above, under no circumstances may you combine this
  77 +* software in any way with any other Broadcom software provided under a
  78 +* license other than the GPL, without Broadcom's express prior written
  79 +* consent.
  80 +*****************************************************************************/
  81 +
  82 +#include <linux/kernel.h>
  83 +#include <linux/module.h>
  84 +#include <linux/init.h>
  85 +#include <linux/hwmon.h>
  86 +#include <linux/hwmon-sysfs.h>
  87 +#include <linux/platform_device.h>
  88 +#include <linux/sysfs.h>
  89 +#include <mach/vcio.h>
  90 +#include <linux/slab.h>
  91 +#include <linux/err.h>
  92 +
  93 +#define MODULE_NAME "bcm2835_hwmon"
  94 +
  95 +/*#define HWMON_DEBUG_ENABLE*/
  96 +
  97 +#ifdef HWMON_DEBUG_ENABLE
  98 +#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
  99 +#else
 100 +#define print_debug(fmt,...)
 101 +#endif
 102 +#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
 103 +#define print_info(fmt,...) printk(KERN_INFO "%s: "fmt"\n", MODULE_NAME, ##__VA_ARGS__)
 104 +
 105 +#define VC_TAG_GET_TEMP 0x00030006
 106 +#define VC_TAG_GET_MAX_TEMP 0x0003000A
 107 +
 108 +/* --- STRUCTS --- */
 109 +struct bcm2835_hwmon_data {
 110 +       struct device *hwmon_dev;
 111 +};
 112 +
 113 +/* tag part of the message */
 114 +struct vc_msg_tag {
 115 +       uint32_t tag_id;                /* the tag ID for the temperature */
 116 +       uint32_t buffer_size;   /* size of the buffer (should be 8) */
 117 +       uint32_t request_code;  /* identifies message as a request (should be 0) */
 118 +       uint32_t id;                    /* extra ID field (should be 0) */
 119 +       uint32_t val;                   /* returned value of the temperature */
 120 +};
 121 +
 122 +/* message structure to be sent to videocore */
 123 +struct vc_msg {
 124 +       uint32_t msg_size;              /* simply, sizeof(struct vc_msg) */
 125 +       uint32_t request_code;          /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
 126 +       struct vc_msg_tag tag;          /* the tag structure above to make */
 127 +       uint32_t end_tag;               /* an end identifier, should be set to NULL */
 128 +};
 129 +
 130 +typedef enum {
 131 +       TEMP,
 132 +       MAX_TEMP,
 133 +} temp_type;
 134 +
 135 +/* --- PROTOTYPES --- */
 136 +static ssize_t bcm2835_get_temp(struct device *dev, struct device_attribute *attr, char *buf);
 137 +static ssize_t bcm2835_get_name(struct device *dev, struct device_attribute *attr, char *buf);
 138 +
 139 +/* --- GLOBALS --- */
 140 +
 141 +static struct bcm2835_hwmon_data *bcm2835_data;
 142 +static struct platform_driver bcm2835_hwmon_driver;
 143 +
 144 +static SENSOR_DEVICE_ATTR(name, S_IRUGO,bcm2835_get_name,NULL,0);
 145 +static SENSOR_DEVICE_ATTR(temp1_input,S_IRUGO,bcm2835_get_temp,NULL,TEMP);
 146 +static SENSOR_DEVICE_ATTR(temp1_max,S_IRUGO,bcm2835_get_temp,NULL,MAX_TEMP);
 147 +
 148 +static struct attribute* bcm2835_attributes[] = {
 149 +       &sensor_dev_attr_name.dev_attr.attr,
 150 +       &sensor_dev_attr_temp1_input.dev_attr.attr,
 151 +       &sensor_dev_attr_temp1_max.dev_attr.attr,
 152 +       NULL,
 153 +};
 154 +
 155 +static struct attribute_group bcm2835_attr_group = {
 156 +       .attrs = bcm2835_attributes,
 157 +};
 158 +
 159 +/* --- FUNCTIONS --- */
 160 +
 161 +static ssize_t bcm2835_get_name(struct device *dev, struct device_attribute *attr, char *buf)
 162 +{
 163 +       return sprintf(buf,"bcm2835_hwmon\n");
 164 +}
 165 +
 166 +static ssize_t bcm2835_get_temp(struct device *dev, struct device_attribute *attr, char *buf)
 167 +{
 168 +       struct vc_msg msg;
 169 +       int result;
 170 +       uint temp = 0;
 171 +       int index = ((struct sensor_device_attribute*)to_sensor_dev_attr(attr))->index;
 172 +
 173 +       print_debug("IN");
 174 +
 175 +       /* wipe all previous message data */
 176 +       memset(&msg, 0, sizeof msg);
 177 +
 178 +       /* determine the message type */
 179 +       if(index == TEMP)
 180 +               msg.tag.tag_id = VC_TAG_GET_TEMP;
 181 +       else if (index == MAX_TEMP)
 182 +               msg.tag.tag_id = VC_TAG_GET_MAX_TEMP;
 183 +       else
 184 +       {
 185 +               print_debug("Unknown temperature message!");
 186 +               return -EINVAL;
 187 +       }
 188 +
 189 +       msg.msg_size = sizeof msg;
 190 +       msg.tag.buffer_size = 8;
 191 +
 192 +       /* send the message */
 193 +       result = bcm_mailbox_property(&msg, sizeof msg);
 194 +
 195 +       /* check if it was all ok and return the rate in milli degrees C */
 196 +       if (result == 0 && (msg.request_code & 0x80000000))
 197 +               temp = (uint)msg.tag.val;
 198 +       #ifdef HWMON_DEBUG_ENABLE
 199 +       else
 200 +               print_debug("Failed to get temperature!");
 201 +       #endif
 202 +       print_debug("Got temperature as %u",temp);
 203 +       print_debug("OUT");
 204 +       return sprintf(buf, "%u\n", temp);
 205 +}
 206 +
 207 +
 208 +static int bcm2835_hwmon_probe(struct platform_device *pdev)
 209 +{
 210 +       int err;
 211 +
 212 +       print_debug("IN");
 213 +       print_debug("HWMON Driver has been probed!");
 214 +
 215 +       /* check that the device isn't null!*/
 216 +       if(pdev == NULL)
 217 +       {
 218 +               print_debug("Platform device is empty!");
 219 +               return -ENODEV;
 220 +       }
 221 +
 222 +       /* allocate memory for neccessary data */
 223 +       bcm2835_data = kzalloc(sizeof(struct bcm2835_hwmon_data),GFP_KERNEL);
 224 +       if(!bcm2835_data)
 225 +       {
 226 +               print_debug("Unable to allocate memory for hwmon data!");
 227 +               err = -ENOMEM;
 228 +               goto kzalloc_error;
 229 +       }
 230 +
 231 +       /* create the sysfs files */
 232 +       if(sysfs_create_group(&pdev->dev.kobj, &bcm2835_attr_group))
 233 +       {
 234 +               print_debug("Unable to create sysfs files!");
 235 +               err = -EFAULT;
 236 +               goto sysfs_error;
 237 +       }
 238 +
 239 +       /* register the hwmon device */
 240 +       bcm2835_data->hwmon_dev = hwmon_device_register(&pdev->dev);
 241 +       if (IS_ERR(bcm2835_data->hwmon_dev))
 242 +       {
 243 +               err = PTR_ERR(bcm2835_data->hwmon_dev);
 244 +               goto hwmon_error;
 245 +       }
 246 +       print_debug("OUT");
 247 +       return 0;
 248 +
 249 +       /* error goto's */
 250 +       hwmon_error:
 251 +       sysfs_remove_group(&pdev->dev.kobj, &bcm2835_attr_group);
 252 +
 253 +       sysfs_error:
 254 +       kfree(bcm2835_data);
 255 +
 256 +       kzalloc_error:
 257 +
 258 +       return err;
 259 +
 260 +}
 261 +
 262 +static int bcm2835_hwmon_remove(struct platform_device *pdev)
 263 +{
 264 +       print_debug("IN");
 265 +       hwmon_device_unregister(bcm2835_data->hwmon_dev);
 266 +
 267 +       sysfs_remove_group(&pdev->dev.kobj, &bcm2835_attr_group);
 268 +       print_debug("OUT");
 269 +       return 0;
 270 +}
 271 +
 272 +/* Hwmon Driver */
 273 +static struct platform_driver bcm2835_hwmon_driver = {
 274 +       .probe = bcm2835_hwmon_probe,
 275 +       .remove = bcm2835_hwmon_remove,
 276 +       .driver = {
 277 +                               .name = "bcm2835_hwmon",
 278 +                               .owner = THIS_MODULE,
 279 +                       },
 280 +};
 281 +
 282 +MODULE_LICENSE("GPL");
 283 +MODULE_AUTHOR("Dorian Peake");
 284 +MODULE_DESCRIPTION("HW Monitor driver for bcm2835 chip");
 285 +
 286 +module_platform_driver(bcm2835_hwmon_driver);
 287 --- a/drivers/thermal/Kconfig
 288 +++ b/drivers/thermal/Kconfig
 289 @@ -196,6 +196,12 @@ config INTEL_POWERCLAMP
 290           enforce idle time which results in more package C-state residency. The
 291           user interface is exposed via generic thermal framework.
 292
 293 +config THERMAL_BCM2835
 294 +       tristate "BCM2835 Thermal Driver"
 295 +       help
 296 +         This will enable temperature monitoring for the Broadcom BCM2835
 297 +         chip. If built as a module, it will be called 'bcm2835-thermal'.
 298 +
 299  config X86_PKG_TEMP_THERMAL
 300         tristate "X86 package temperature thermal driver"
 301         depends on X86_THERMAL_VECTOR
 302 --- a/drivers/thermal/Makefile
 303 +++ b/drivers/thermal/Makefile
 304 @@ -28,6 +28,7 @@ obj-$(CONFIG_ARMADA_THERMAL)  += armada_t
 305  obj-$(CONFIG_IMX_THERMAL)      += imx_thermal.o
 306  obj-$(CONFIG_DB8500_CPUFREQ_COOLING)   += db8500_cpufreq_cooling.o
 307  obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
 308 +obj-$(CONFIG_THERMAL_BCM2835)  += bcm2835-thermal.o
 309  obj-$(CONFIG_X86_PKG_TEMP_THERMAL)     += x86_pkg_temp_thermal.o
 310  obj-$(CONFIG_TI_SOC_THERMAL)   += ti-soc-thermal/
 311  obj-$(CONFIG_ACPI_INT3403_THERMAL)     += int3403_thermal.o
 312 --- /dev/null
 313 +++ b/drivers/thermal/bcm2835-thermal.c
 314 @@ -0,0 +1,184 @@
 315 +/*****************************************************************************
 316 +* Copyright 2011 Broadcom Corporation.  All rights reserved.
 317 +*
 318 +* Unless you and Broadcom execute a separate written software license
 319 +* agreement governing use of this software, this software is licensed to you
 320 +* under the terms of the GNU General Public License version 2, available at
 321 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
 322 +*
 323 +* Notwithstanding the above, under no circumstances may you combine this
 324 +* software in any way with any other Broadcom software provided under a
 325 +* license other than the GPL, without Broadcom's express prior written
 326 +* consent.
 327 +*****************************************************************************/
 328 +
 329 +#include <linux/kernel.h>
 330 +#include <linux/module.h>
 331 +#include <linux/init.h>
 332 +#include <linux/platform_device.h>
 333 +#include <linux/slab.h>
 334 +#include <linux/sysfs.h>
 335 +#include <mach/vcio.h>
 336 +#include <linux/thermal.h>
 337 +
 338 +
 339 +/* --- DEFINITIONS --- */
 340 +#define MODULE_NAME "bcm2835_thermal"
 341 +
 342 +/*#define THERMAL_DEBUG_ENABLE*/
 343 +
 344 +#ifdef THERMAL_DEBUG_ENABLE
 345 +#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
 346 +#else
 347 +#define print_debug(fmt,...)
 348 +#endif
 349 +#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
 350 +
 351 +#define VC_TAG_GET_TEMP 0x00030006
 352 +#define VC_TAG_GET_MAX_TEMP 0x0003000A
 353 +
 354 +typedef enum {
 355 +       TEMP,
 356 +       MAX_TEMP,
 357 +} temp_type;
 358 +
 359 +/* --- STRUCTS --- */
 360 +/* tag part of the message */
 361 +struct vc_msg_tag {
 362 +       uint32_t tag_id;                /* the tag ID for the temperature */
 363 +       uint32_t buffer_size;   /* size of the buffer (should be 8) */
 364 +       uint32_t request_code;  /* identifies message as a request (should be 0) */
 365 +       uint32_t id;                    /* extra ID field (should be 0) */
 366 +       uint32_t val;                   /* returned value of the temperature */
 367 +};
 368 +
 369 +/* message structure to be sent to videocore */
 370 +struct vc_msg {
 371 +       uint32_t msg_size;              /* simply, sizeof(struct vc_msg) */
 372 +       uint32_t request_code;          /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
 373 +       struct vc_msg_tag tag;          /* the tag structure above to make */
 374 +       uint32_t end_tag;               /* an end identifier, should be set to NULL */
 375 +};
 376 +
 377 +struct bcm2835_thermal_data {
 378 +       struct thermal_zone_device *thermal_dev;
 379 +       struct vc_msg msg;
 380 +};
 381 +
 382 +/* --- GLOBALS --- */
 383 +static struct bcm2835_thermal_data bcm2835_data;
 384 +
 385 +/* Thermal Device Operations */
 386 +static struct thermal_zone_device_ops ops;
 387 +
 388 +/* --- FUNCTIONS --- */
 389 +
 390 +static int bcm2835_get_temp_or_max(struct thermal_zone_device *thermal_dev, unsigned long *temp, unsigned tag_id)
 391 +{
 392 +       int result = -1, retry = 3;
 393 +       print_debug("IN");
 394 +
 395 +       *temp = 0;
 396 +       while (result != 0 && retry-- > 0) {
 397 +               /* wipe all previous message data */
 398 +               memset(&bcm2835_data.msg, 0, sizeof bcm2835_data.msg);
 399 +
 400 +               /* prepare message */
 401 +               bcm2835_data.msg.msg_size = sizeof bcm2835_data.msg;
 402 +               bcm2835_data.msg.tag.buffer_size = 8;
 403 +               bcm2835_data.msg.tag.tag_id = tag_id;
 404 +
 405 +               /* send the message */
 406 +               result = bcm_mailbox_property(&bcm2835_data.msg, sizeof bcm2835_data.msg);
 407 +               print_debug("Got %stemperature as %u (%d,%x)\n", tag_id==VC_TAG_GET_MAX_TEMP ? "max ":"", (uint)bcm2835_data.msg.tag.val, result, bcm2835_data.msg.request_code);
 408 +               if (!(bcm2835_data.msg.request_code & 0x80000000))
 409 +                       result = -1;
 410 +       }
 411 +
 412 +       /* check if it was all ok and return the rate in milli degrees C */
 413 +       if (result == 0)
 414 +               *temp = (uint)bcm2835_data.msg.tag.val;
 415 +       else
 416 +               print_err("Failed to get temperature! (%x:%d)\n", tag_id, result);
 417 +       print_debug("OUT");
 418 +       return result;
 419 +}
 420 +
 421 +static int bcm2835_get_temp(struct thermal_zone_device *thermal_dev, unsigned long *temp)
 422 +{
 423 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_TEMP);
 424 +}
 425 +
 426 +static int bcm2835_get_max_temp(struct thermal_zone_device *thermal_dev, int trip_num, unsigned long *temp)
 427 +{
 428 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_MAX_TEMP);
 429 +}
 430 +
 431 +static int bcm2835_get_trip_type(struct thermal_zone_device * thermal_dev, int trip_num, enum thermal_trip_type *trip_type)
 432 +{
 433 +       *trip_type = THERMAL_TRIP_HOT;
 434 +       return 0;
 435 +}
 436 +
 437 +
 438 +static int bcm2835_get_mode(struct thermal_zone_device *thermal_dev, enum thermal_device_mode *dev_mode)
 439 +{
 440 +       *dev_mode = THERMAL_DEVICE_ENABLED;
 441 +       return 0;
 442 +}
 443 +
 444 +
 445 +static int bcm2835_thermal_probe(struct platform_device *pdev)
 446 +{
 447 +       print_debug("IN");
 448 +       print_debug("THERMAL Driver has been probed!");
 449 +
 450 +       /* check that the device isn't null!*/
 451 +       if(pdev == NULL)
 452 +       {
 453 +               print_debug("Platform device is empty!");
 454 +               return -ENODEV;
 455 +       }
 456 +
 457 +       if(!(bcm2835_data.thermal_dev = thermal_zone_device_register("bcm2835_thermal",  1, 0, NULL, &ops, NULL, 0, 0)))
 458 +       {
 459 +               print_debug("Unable to register the thermal device!");
 460 +               return -EFAULT;
 461 +       }
 462 +       return 0;
 463 +}
 464 +
 465 +
 466 +static int bcm2835_thermal_remove(struct platform_device *pdev)
 467 +{
 468 +       print_debug("IN");
 469 +
 470 +       thermal_zone_device_unregister(bcm2835_data.thermal_dev);
 471 +
 472 +       print_debug("OUT");
 473 +
 474 +       return 0;
 475 +}
 476 +
 477 +static struct thermal_zone_device_ops ops  = {
 478 +       .get_temp = bcm2835_get_temp,
 479 +       .get_trip_temp = bcm2835_get_max_temp,
 480 +       .get_trip_type = bcm2835_get_trip_type,
 481 +       .get_mode = bcm2835_get_mode,
 482 +};
 483 +
 484 +/* Thermal Driver */
 485 +static struct platform_driver bcm2835_thermal_driver = {
 486 +       .probe = bcm2835_thermal_probe,
 487 +       .remove = bcm2835_thermal_remove,
 488 +       .driver = {
 489 +                               .name = "bcm2835_thermal",
 490 +                               .owner = THIS_MODULE,
 491 +                       },
 492 +};
 493 +
 494 +MODULE_LICENSE("GPL");
 495 +MODULE_AUTHOR("Dorian Peake");
 496 +MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
 497 +
 498 +module_platform_driver(bcm2835_thermal_driver);