target/linux/brcm2708/patches-3.18/0017-Added-hwmon-thermal-driver-for-reporting-core-temper.patch

   1 From de9bdcff7ec73589cb314a1569ce5aba5fe09146 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 017/114] 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 @@ -455,6 +455,14 @@ 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 @@ -563,6 +571,9 @@ 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 @@ -1689,6 +1689,16 @@ config SENSORS_ULTRA45
  49           This driver provides support for the Ultra45 workstation environmental
  50           sensors.
  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 --- a/drivers/hwmon/Makefile
  66 +++ b/drivers/hwmon/Makefile
  67 @@ -154,6 +154,7 @@ obj-$(CONFIG_SENSORS_W83L786NG)     += w83l7
  68  obj-$(CONFIG_SENSORS_WM831X)   += wm831x-hwmon.o
  69  obj-$(CONFIG_SENSORS_WM8350)   += wm8350-hwmon.o
  70  obj-$(CONFIG_SENSORS_GSC)      += gsc.o
  71 +obj-$(CONFIG_SENSORS_BCM2835)  += bcm2835-hwmon.o
  72
  73  obj-$(CONFIG_PMBUS)            += pmbus/
  74
  75 --- /dev/null
  76 +++ b/drivers/hwmon/bcm2835-hwmon.c
  77 @@ -0,0 +1,219 @@
  78 +/*****************************************************************************
  79 +* Copyright 2011 Broadcom Corporation.  All rights reserved.
  80 +*
  81 +* Unless you and Broadcom execute a separate written software license
  82 +* agreement governing use of this software, this software is licensed to you
  83 +* under the terms of the GNU General Public License version 2, available at
  84 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
  85 +*
  86 +* Notwithstanding the above, under no circumstances may you combine this
  87 +* software in any way with any other Broadcom software provided under a
  88 +* license other than the GPL, without Broadcom's express prior written
  89 +* consent.
  90 +*****************************************************************************/
  91 +
  92 +#include <linux/kernel.h>
  93 +#include <linux/module.h>
  94 +#include <linux/init.h>
  95 +#include <linux/hwmon.h>
  96 +#include <linux/hwmon-sysfs.h>
  97 +#include <linux/platform_device.h>
  98 +#include <linux/sysfs.h>
  99 +#include <mach/vcio.h>
 100 +#include <linux/slab.h>
 101 +#include <linux/err.h>
 102 +
 103 +#define MODULE_NAME "bcm2835_hwmon"
 104 +
 105 +/*#define HWMON_DEBUG_ENABLE*/
 106 +
 107 +#ifdef HWMON_DEBUG_ENABLE
 108 +#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
 109 +#else
 110 +#define print_debug(fmt,...)
 111 +#endif
 112 +#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
 113 +#define print_info(fmt,...) printk(KERN_INFO "%s: "fmt"\n", MODULE_NAME, ##__VA_ARGS__)
 114 +
 115 +#define VC_TAG_GET_TEMP 0x00030006
 116 +#define VC_TAG_GET_MAX_TEMP 0x0003000A
 117 +
 118 +/* --- STRUCTS --- */
 119 +struct bcm2835_hwmon_data {
 120 +       struct device *hwmon_dev;
 121 +};
 122 +
 123 +/* tag part of the message */
 124 +struct vc_msg_tag {
 125 +       uint32_t tag_id;                /* the tag ID for the temperature */
 126 +       uint32_t buffer_size;   /* size of the buffer (should be 8) */
 127 +       uint32_t request_code;  /* identifies message as a request (should be 0) */
 128 +       uint32_t id;                    /* extra ID field (should be 0) */
 129 +       uint32_t val;                   /* returned value of the temperature */
 130 +};
 131 +
 132 +/* message structure to be sent to videocore */
 133 +struct vc_msg {
 134 +       uint32_t msg_size;              /* simply, sizeof(struct vc_msg) */
 135 +       uint32_t request_code;          /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
 136 +       struct vc_msg_tag tag;          /* the tag structure above to make */
 137 +       uint32_t end_tag;               /* an end identifier, should be set to NULL */
 138 +};
 139 +
 140 +typedef enum {
 141 +       TEMP,
 142 +       MAX_TEMP,
 143 +} temp_type;
 144 +
 145 +/* --- PROTOTYPES --- */
 146 +static ssize_t bcm2835_get_temp(struct device *dev, struct device_attribute *attr, char *buf);
 147 +static ssize_t bcm2835_get_name(struct device *dev, struct device_attribute *attr, char *buf);
 148 +
 149 +/* --- GLOBALS --- */
 150 +
 151 +static struct bcm2835_hwmon_data *bcm2835_data;
 152 +static struct platform_driver bcm2835_hwmon_driver;
 153 +
 154 +static SENSOR_DEVICE_ATTR(name, S_IRUGO,bcm2835_get_name,NULL,0);
 155 +static SENSOR_DEVICE_ATTR(temp1_input,S_IRUGO,bcm2835_get_temp,NULL,TEMP);
 156 +static SENSOR_DEVICE_ATTR(temp1_max,S_IRUGO,bcm2835_get_temp,NULL,MAX_TEMP);
 157 +
 158 +static struct attribute* bcm2835_attributes[] = {
 159 +       &sensor_dev_attr_name.dev_attr.attr,
 160 +       &sensor_dev_attr_temp1_input.dev_attr.attr,
 161 +       &sensor_dev_attr_temp1_max.dev_attr.attr,
 162 +       NULL,
 163 +};
 164 +
 165 +static struct attribute_group bcm2835_attr_group = {
 166 +       .attrs = bcm2835_attributes,
 167 +};
 168 +
 169 +/* --- FUNCTIONS --- */
 170 +
 171 +static ssize_t bcm2835_get_name(struct device *dev, struct device_attribute *attr, char *buf)
 172 +{
 173 +       return sprintf(buf,"bcm2835_hwmon\n");
 174 +}
 175 +
 176 +static ssize_t bcm2835_get_temp(struct device *dev, struct device_attribute *attr, char *buf)
 177 +{
 178 +       struct vc_msg msg;
 179 +       int result;
 180 +       uint temp = 0;
 181 +       int index = ((struct sensor_device_attribute*)to_sensor_dev_attr(attr))->index;
 182 +
 183 +       print_debug("IN");
 184 +
 185 +       /* wipe all previous message data */
 186 +       memset(&msg, 0, sizeof msg);
 187 +
 188 +       /* determine the message type */
 189 +       if(index == TEMP)
 190 +               msg.tag.tag_id = VC_TAG_GET_TEMP;
 191 +       else if (index == MAX_TEMP)
 192 +               msg.tag.tag_id = VC_TAG_GET_MAX_TEMP;
 193 +       else
 194 +       {
 195 +               print_debug("Unknown temperature message!");
 196 +               return -EINVAL;
 197 +       }
 198 +
 199 +       msg.msg_size = sizeof msg;
 200 +       msg.tag.buffer_size = 8;
 201 +
 202 +       /* send the message */
 203 +       result = bcm_mailbox_property(&msg, sizeof msg);
 204 +
 205 +       /* check if it was all ok and return the rate in milli degrees C */
 206 +       if (result == 0 && (msg.request_code & 0x80000000))
 207 +               temp = (uint)msg.tag.val;
 208 +       #ifdef HWMON_DEBUG_ENABLE
 209 +       else
 210 +               print_debug("Failed to get temperature!");
 211 +       #endif
 212 +       print_debug("Got temperature as %u",temp);
 213 +       print_debug("OUT");
 214 +       return sprintf(buf, "%u\n", temp);
 215 +}
 216 +
 217 +
 218 +static int bcm2835_hwmon_probe(struct platform_device *pdev)
 219 +{
 220 +       int err;
 221 +
 222 +       print_debug("IN");
 223 +       print_debug("HWMON Driver has been probed!");
 224 +
 225 +       /* check that the device isn't null!*/
 226 +       if(pdev == NULL)
 227 +       {
 228 +               print_debug("Platform device is empty!");
 229 +               return -ENODEV;
 230 +       }
 231 +
 232 +       /* allocate memory for neccessary data */
 233 +       bcm2835_data = kzalloc(sizeof(struct bcm2835_hwmon_data),GFP_KERNEL);
 234 +       if(!bcm2835_data)
 235 +       {
 236 +               print_debug("Unable to allocate memory for hwmon data!");
 237 +               err = -ENOMEM;
 238 +               goto kzalloc_error;
 239 +       }
 240 +
 241 +       /* create the sysfs files */
 242 +       if(sysfs_create_group(&pdev->dev.kobj, &bcm2835_attr_group))
 243 +       {
 244 +               print_debug("Unable to create sysfs files!");
 245 +               err = -EFAULT;
 246 +               goto sysfs_error;
 247 +       }
 248 +
 249 +       /* register the hwmon device */
 250 +       bcm2835_data->hwmon_dev = hwmon_device_register(&pdev->dev);
 251 +       if (IS_ERR(bcm2835_data->hwmon_dev))
 252 +       {
 253 +               err = PTR_ERR(bcm2835_data->hwmon_dev);
 254 +               goto hwmon_error;
 255 +       }
 256 +       print_debug("OUT");
 257 +       return 0;
 258 +
 259 +       /* error goto's */
 260 +       hwmon_error:
 261 +       sysfs_remove_group(&pdev->dev.kobj, &bcm2835_attr_group);
 262 +
 263 +       sysfs_error:
 264 +       kfree(bcm2835_data);
 265 +
 266 +       kzalloc_error:
 267 +
 268 +       return err;
 269 +
 270 +}
 271 +
 272 +static int bcm2835_hwmon_remove(struct platform_device *pdev)
 273 +{
 274 +       print_debug("IN");
 275 +       hwmon_device_unregister(bcm2835_data->hwmon_dev);
 276 +
 277 +       sysfs_remove_group(&pdev->dev.kobj, &bcm2835_attr_group);
 278 +       print_debug("OUT");
 279 +       return 0;
 280 +}
 281 +
 282 +/* Hwmon Driver */
 283 +static struct platform_driver bcm2835_hwmon_driver = {
 284 +       .probe = bcm2835_hwmon_probe,
 285 +       .remove = bcm2835_hwmon_remove,
 286 +       .driver = {
 287 +                               .name = "bcm2835_hwmon",
 288 +                               .owner = THIS_MODULE,
 289 +                       },
 290 +};
 291 +
 292 +MODULE_LICENSE("GPL");
 293 +MODULE_AUTHOR("Dorian Peake");
 294 +MODULE_DESCRIPTION("HW Monitor driver for bcm2835 chip");
 295 +
 296 +module_platform_driver(bcm2835_hwmon_driver);
 297 --- a/drivers/thermal/Kconfig
 298 +++ b/drivers/thermal/Kconfig
 299 @@ -206,6 +206,12 @@ config INTEL_POWERCLAMP
 300           enforce idle time which results in more package C-state residency. The
 301           user interface is exposed via generic thermal framework.
 302
 303 +config THERMAL_BCM2835
 304 +       tristate "BCM2835 Thermal Driver"
 305 +       help
 306 +         This will enable temperature monitoring for the Broadcom BCM2835
 307 +         chip. If built as a module, it will be called 'bcm2835-thermal'.
 308 +
 309  config X86_PKG_TEMP_THERMAL
 310         tristate "X86 package temperature thermal driver"
 311         depends on X86_THERMAL_VECTOR
 312 --- a/drivers/thermal/Makefile
 313 +++ b/drivers/thermal/Makefile
 314 @@ -29,6 +29,7 @@ obj-$(CONFIG_ARMADA_THERMAL)  += armada_t
 315  obj-$(CONFIG_IMX_THERMAL)      += imx_thermal.o
 316  obj-$(CONFIG_DB8500_CPUFREQ_COOLING)   += db8500_cpufreq_cooling.o
 317  obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
 318 +obj-$(CONFIG_THERMAL_BCM2835)  += bcm2835-thermal.o
 319  obj-$(CONFIG_X86_PKG_TEMP_THERMAL)     += x86_pkg_temp_thermal.o
 320  obj-$(CONFIG_INTEL_SOC_DTS_THERMAL)    += intel_soc_dts_thermal.o
 321  obj-$(CONFIG_TI_SOC_THERMAL)   += ti-soc-thermal/
 322 --- /dev/null
 323 +++ b/drivers/thermal/bcm2835-thermal.c
 324 @@ -0,0 +1,184 @@
 325 +/*****************************************************************************
 326 +* Copyright 2011 Broadcom Corporation.  All rights reserved.
 327 +*
 328 +* Unless you and Broadcom execute a separate written software license
 329 +* agreement governing use of this software, this software is licensed to you
 330 +* under the terms of the GNU General Public License version 2, available at
 331 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
 332 +*
 333 +* Notwithstanding the above, under no circumstances may you combine this
 334 +* software in any way with any other Broadcom software provided under a
 335 +* license other than the GPL, without Broadcom's express prior written
 336 +* consent.
 337 +*****************************************************************************/
 338 +
 339 +#include <linux/kernel.h>
 340 +#include <linux/module.h>
 341 +#include <linux/init.h>
 342 +#include <linux/platform_device.h>
 343 +#include <linux/slab.h>
 344 +#include <linux/sysfs.h>
 345 +#include <mach/vcio.h>
 346 +#include <linux/thermal.h>
 347 +
 348 +
 349 +/* --- DEFINITIONS --- */
 350 +#define MODULE_NAME "bcm2835_thermal"
 351 +
 352 +/*#define THERMAL_DEBUG_ENABLE*/
 353 +
 354 +#ifdef THERMAL_DEBUG_ENABLE
 355 +#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
 356 +#else
 357 +#define print_debug(fmt,...)
 358 +#endif
 359 +#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
 360 +
 361 +#define VC_TAG_GET_TEMP 0x00030006
 362 +#define VC_TAG_GET_MAX_TEMP 0x0003000A
 363 +
 364 +typedef enum {
 365 +       TEMP,
 366 +       MAX_TEMP,
 367 +} temp_type;
 368 +
 369 +/* --- STRUCTS --- */
 370 +/* tag part of the message */
 371 +struct vc_msg_tag {
 372 +       uint32_t tag_id;                /* the tag ID for the temperature */
 373 +       uint32_t buffer_size;   /* size of the buffer (should be 8) */
 374 +       uint32_t request_code;  /* identifies message as a request (should be 0) */
 375 +       uint32_t id;                    /* extra ID field (should be 0) */
 376 +       uint32_t val;                   /* returned value of the temperature */
 377 +};
 378 +
 379 +/* message structure to be sent to videocore */
 380 +struct vc_msg {
 381 +       uint32_t msg_size;              /* simply, sizeof(struct vc_msg) */
 382 +       uint32_t request_code;          /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
 383 +       struct vc_msg_tag tag;          /* the tag structure above to make */
 384 +       uint32_t end_tag;               /* an end identifier, should be set to NULL */
 385 +};
 386 +
 387 +struct bcm2835_thermal_data {
 388 +       struct thermal_zone_device *thermal_dev;
 389 +       struct vc_msg msg;
 390 +};
 391 +
 392 +/* --- GLOBALS --- */
 393 +static struct bcm2835_thermal_data bcm2835_data;
 394 +
 395 +/* Thermal Device Operations */
 396 +static struct thermal_zone_device_ops ops;
 397 +
 398 +/* --- FUNCTIONS --- */
 399 +
 400 +static int bcm2835_get_temp_or_max(struct thermal_zone_device *thermal_dev, unsigned long *temp, unsigned tag_id)
 401 +{
 402 +       int result = -1, retry = 3;
 403 +       print_debug("IN");
 404 +
 405 +       *temp = 0;
 406 +       while (result != 0 && retry-- > 0) {
 407 +               /* wipe all previous message data */
 408 +               memset(&bcm2835_data.msg, 0, sizeof bcm2835_data.msg);
 409 +
 410 +               /* prepare message */
 411 +               bcm2835_data.msg.msg_size = sizeof bcm2835_data.msg;
 412 +               bcm2835_data.msg.tag.buffer_size = 8;
 413 +               bcm2835_data.msg.tag.tag_id = tag_id;
 414 +
 415 +               /* send the message */
 416 +               result = bcm_mailbox_property(&bcm2835_data.msg, sizeof bcm2835_data.msg);
 417 +               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);
 418 +               if (!(bcm2835_data.msg.request_code & 0x80000000))
 419 +                       result = -1;
 420 +       }
 421 +
 422 +       /* check if it was all ok and return the rate in milli degrees C */
 423 +       if (result == 0)
 424 +               *temp = (uint)bcm2835_data.msg.tag.val;
 425 +       else
 426 +               print_err("Failed to get temperature! (%x:%d)\n", tag_id, result);
 427 +       print_debug("OUT");
 428 +       return result;
 429 +}
 430 +
 431 +static int bcm2835_get_temp(struct thermal_zone_device *thermal_dev, unsigned long *temp)
 432 +{
 433 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_TEMP);
 434 +}
 435 +
 436 +static int bcm2835_get_max_temp(struct thermal_zone_device *thermal_dev, int trip_num, unsigned long *temp)
 437 +{
 438 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_MAX_TEMP);
 439 +}
 440 +
 441 +static int bcm2835_get_trip_type(struct thermal_zone_device * thermal_dev, int trip_num, enum thermal_trip_type *trip_type)
 442 +{
 443 +       *trip_type = THERMAL_TRIP_HOT;
 444 +       return 0;
 445 +}
 446 +
 447 +
 448 +static int bcm2835_get_mode(struct thermal_zone_device *thermal_dev, enum thermal_device_mode *dev_mode)
 449 +{
 450 +       *dev_mode = THERMAL_DEVICE_ENABLED;
 451 +       return 0;
 452 +}
 453 +
 454 +
 455 +static int bcm2835_thermal_probe(struct platform_device *pdev)
 456 +{
 457 +       print_debug("IN");
 458 +       print_debug("THERMAL Driver has been probed!");
 459 +
 460 +       /* check that the device isn't null!*/
 461 +       if(pdev == NULL)
 462 +       {
 463 +               print_debug("Platform device is empty!");
 464 +               return -ENODEV;
 465 +       }
 466 +
 467 +       if(!(bcm2835_data.thermal_dev = thermal_zone_device_register("bcm2835_thermal",  1, 0, NULL, &ops, NULL, 0, 0)))
 468 +       {
 469 +               print_debug("Unable to register the thermal device!");
 470 +               return -EFAULT;
 471 +       }
 472 +       return 0;
 473 +}
 474 +
 475 +
 476 +static int bcm2835_thermal_remove(struct platform_device *pdev)
 477 +{
 478 +       print_debug("IN");
 479 +
 480 +       thermal_zone_device_unregister(bcm2835_data.thermal_dev);
 481 +
 482 +       print_debug("OUT");
 483 +
 484 +       return 0;
 485 +}
 486 +
 487 +static struct thermal_zone_device_ops ops  = {
 488 +       .get_temp = bcm2835_get_temp,
 489 +       .get_trip_temp = bcm2835_get_max_temp,
 490 +       .get_trip_type = bcm2835_get_trip_type,
 491 +       .get_mode = bcm2835_get_mode,
 492 +};
 493 +
 494 +/* Thermal Driver */
 495 +static struct platform_driver bcm2835_thermal_driver = {
 496 +       .probe = bcm2835_thermal_probe,
 497 +       .remove = bcm2835_thermal_remove,
 498 +       .driver = {
 499 +                               .name = "bcm2835_thermal",
 500 +                               .owner = THIS_MODULE,
 501 +                       },
 502 +};
 503 +
 504 +MODULE_LICENSE("GPL");
 505 +MODULE_AUTHOR("Dorian Peake");
 506 +MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
 507 +
 508 +module_platform_driver(bcm2835_thermal_driver);