linux/drivers/sbus/char/bbc_envctrl.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

602 lines
16 KiB
C

// SPDX-License-Identifier: GPL-2.0
/* bbc_envctrl.c: UltraSPARC-III environment control driver.
*
* Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net)
*/
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/kmod.h>
#include <linux/reboot.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <asm/oplib.h>
#include "bbc_i2c.h"
#include "max1617.h"
#undef ENVCTRL_TRACE
/* WARNING: Making changes to this driver is very dangerous.
* If you misprogram the sensor chips they can
* cut the power on you instantly.
*/
/* Two temperature sensors exist in the SunBLADE-1000 enclosure.
* Both are implemented using max1617 i2c devices. Each max1617
* monitors 2 temperatures, one for one of the cpu dies and the other
* for the ambient temperature.
*
* The max1617 is capable of being programmed with power-off
* temperature values, one low limit and one high limit. These
* can be controlled independently for the cpu or ambient temperature.
* If a limit is violated, the power is simply shut off. The frequency
* with which the max1617 does temperature sampling can be controlled
* as well.
*
* Three fans exist inside the machine, all three are controlled with
* an i2c digital to analog converter. There is a fan directed at the
* two processor slots, another for the rest of the enclosure, and the
* third is for the power supply. The first two fans may be speed
* controlled by changing the voltage fed to them. The third fan may
* only be completely off or on. The third fan is meant to only be
* disabled/enabled when entering/exiting the lowest power-saving
* mode of the machine.
*
* An environmental control kernel thread periodically monitors all
* temperature sensors. Based upon the samples it will adjust the
* fan speeds to try and keep the system within a certain temperature
* range (the goal being to make the fans as quiet as possible without
* allowing the system to get too hot).
*
* If the temperature begins to rise/fall outside of the acceptable
* operating range, a periodic warning will be sent to the kernel log.
* The fans will be put on full blast to attempt to deal with this
* situation. After exceeding the acceptable operating range by a
* certain threshold, the kernel thread will shut down the system.
* Here, the thread is attempting to shut the machine down cleanly
* before the hardware based power-off event is triggered.
*/
/* These settings are in Celsius. We use these defaults only
* if we cannot interrogate the cpu-fru SEEPROM.
*/
struct temp_limits {
s8 high_pwroff, high_shutdown, high_warn;
s8 low_warn, low_shutdown, low_pwroff;
};
static struct temp_limits cpu_temp_limits[2] = {
{ 100, 85, 80, 5, -5, -10 },
{ 100, 85, 80, 5, -5, -10 },
};
static struct temp_limits amb_temp_limits[2] = {
{ 65, 55, 40, 5, -5, -10 },
{ 65, 55, 40, 5, -5, -10 },
};
static LIST_HEAD(all_temps);
static LIST_HEAD(all_fans);
#define CPU_FAN_REG 0xf0
#define SYS_FAN_REG 0xf2
#define PSUPPLY_FAN_REG 0xf4
#define FAN_SPEED_MIN 0x0c
#define FAN_SPEED_MAX 0x3f
#define PSUPPLY_FAN_ON 0x1f
#define PSUPPLY_FAN_OFF 0x00
static void set_fan_speeds(struct bbc_fan_control *fp)
{
/* Put temperatures into range so we don't mis-program
* the hardware.
*/
if (fp->cpu_fan_speed < FAN_SPEED_MIN)
fp->cpu_fan_speed = FAN_SPEED_MIN;
if (fp->cpu_fan_speed > FAN_SPEED_MAX)
fp->cpu_fan_speed = FAN_SPEED_MAX;
if (fp->system_fan_speed < FAN_SPEED_MIN)
fp->system_fan_speed = FAN_SPEED_MIN;
if (fp->system_fan_speed > FAN_SPEED_MAX)
fp->system_fan_speed = FAN_SPEED_MAX;
#ifdef ENVCTRL_TRACE
printk("fan%d: Changed fan speed to cpu(%02x) sys(%02x)\n",
fp->index,
fp->cpu_fan_speed, fp->system_fan_speed);
#endif
bbc_i2c_writeb(fp->client, fp->cpu_fan_speed, CPU_FAN_REG);
bbc_i2c_writeb(fp->client, fp->system_fan_speed, SYS_FAN_REG);
bbc_i2c_writeb(fp->client,
(fp->psupply_fan_on ?
PSUPPLY_FAN_ON : PSUPPLY_FAN_OFF),
PSUPPLY_FAN_REG);
}
static void get_current_temps(struct bbc_cpu_temperature *tp)
{
tp->prev_amb_temp = tp->curr_amb_temp;
bbc_i2c_readb(tp->client,
(unsigned char *) &tp->curr_amb_temp,
MAX1617_AMB_TEMP);
tp->prev_cpu_temp = tp->curr_cpu_temp;
bbc_i2c_readb(tp->client,
(unsigned char *) &tp->curr_cpu_temp,
MAX1617_CPU_TEMP);
#ifdef ENVCTRL_TRACE
printk("temp%d: cpu(%d C) amb(%d C)\n",
tp->index,
(int) tp->curr_cpu_temp, (int) tp->curr_amb_temp);
#endif
}
static void do_envctrl_shutdown(struct bbc_cpu_temperature *tp)
{
static int shutting_down = 0;
char *type = "???";
s8 val = -1;
if (shutting_down != 0)
return;
if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_shutdown ||
tp->curr_amb_temp < amb_temp_limits[tp->index].low_shutdown) {
type = "ambient";
val = tp->curr_amb_temp;
} else if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_shutdown ||
tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_shutdown) {
type = "CPU";
val = tp->curr_cpu_temp;
}
printk(KERN_CRIT "temp%d: Outside of safe %s "
"operating temperature, %d C.\n",
tp->index, type, val);
printk(KERN_CRIT "kenvctrld: Shutting down the system now.\n");
shutting_down = 1;
orderly_poweroff(true);
}
#define WARN_INTERVAL (30 * HZ)
static void analyze_ambient_temp(struct bbc_cpu_temperature *tp, unsigned long *last_warn, int tick)
{
int ret = 0;
if (time_after(jiffies, (*last_warn + WARN_INTERVAL))) {
if (tp->curr_amb_temp >=
amb_temp_limits[tp->index].high_warn) {
printk(KERN_WARNING "temp%d: "
"Above safe ambient operating temperature, %d C.\n",
tp->index, (int) tp->curr_amb_temp);
ret = 1;
} else if (tp->curr_amb_temp <
amb_temp_limits[tp->index].low_warn) {
printk(KERN_WARNING "temp%d: "
"Below safe ambient operating temperature, %d C.\n",
tp->index, (int) tp->curr_amb_temp);
ret = 1;
}
if (ret)
*last_warn = jiffies;
} else if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_warn ||
tp->curr_amb_temp < amb_temp_limits[tp->index].low_warn)
ret = 1;
/* Now check the shutdown limits. */
if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_shutdown ||
tp->curr_amb_temp < amb_temp_limits[tp->index].low_shutdown) {
do_envctrl_shutdown(tp);
ret = 1;
}
if (ret) {
tp->fan_todo[FAN_AMBIENT] = FAN_FULLBLAST;
} else if ((tick & (8 - 1)) == 0) {
s8 amb_goal_hi = amb_temp_limits[tp->index].high_warn - 10;
s8 amb_goal_lo;
amb_goal_lo = amb_goal_hi - 3;
/* We do not try to avoid 'too cold' events. Basically we
* only try to deal with over-heating and fan noise reduction.
*/
if (tp->avg_amb_temp < amb_goal_hi) {
if (tp->avg_amb_temp >= amb_goal_lo)
tp->fan_todo[FAN_AMBIENT] = FAN_SAME;
else
tp->fan_todo[FAN_AMBIENT] = FAN_SLOWER;
} else {
tp->fan_todo[FAN_AMBIENT] = FAN_FASTER;
}
} else {
tp->fan_todo[FAN_AMBIENT] = FAN_SAME;
}
}
static void analyze_cpu_temp(struct bbc_cpu_temperature *tp, unsigned long *last_warn, int tick)
{
int ret = 0;
if (time_after(jiffies, (*last_warn + WARN_INTERVAL))) {
if (tp->curr_cpu_temp >=
cpu_temp_limits[tp->index].high_warn) {
printk(KERN_WARNING "temp%d: "
"Above safe CPU operating temperature, %d C.\n",
tp->index, (int) tp->curr_cpu_temp);
ret = 1;
} else if (tp->curr_cpu_temp <
cpu_temp_limits[tp->index].low_warn) {
printk(KERN_WARNING "temp%d: "
"Below safe CPU operating temperature, %d C.\n",
tp->index, (int) tp->curr_cpu_temp);
ret = 1;
}
if (ret)
*last_warn = jiffies;
} else if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_warn ||
tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_warn)
ret = 1;
/* Now check the shutdown limits. */
if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_shutdown ||
tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_shutdown) {
do_envctrl_shutdown(tp);
ret = 1;
}
if (ret) {
tp->fan_todo[FAN_CPU] = FAN_FULLBLAST;
} else if ((tick & (8 - 1)) == 0) {
s8 cpu_goal_hi = cpu_temp_limits[tp->index].high_warn - 10;
s8 cpu_goal_lo;
cpu_goal_lo = cpu_goal_hi - 3;
/* We do not try to avoid 'too cold' events. Basically we
* only try to deal with over-heating and fan noise reduction.
*/
if (tp->avg_cpu_temp < cpu_goal_hi) {
if (tp->avg_cpu_temp >= cpu_goal_lo)
tp->fan_todo[FAN_CPU] = FAN_SAME;
else
tp->fan_todo[FAN_CPU] = FAN_SLOWER;
} else {
tp->fan_todo[FAN_CPU] = FAN_FASTER;
}
} else {
tp->fan_todo[FAN_CPU] = FAN_SAME;
}
}
static void analyze_temps(struct bbc_cpu_temperature *tp, unsigned long *last_warn)
{
tp->avg_amb_temp = (s8)((int)((int)tp->avg_amb_temp + (int)tp->curr_amb_temp) / 2);
tp->avg_cpu_temp = (s8)((int)((int)tp->avg_cpu_temp + (int)tp->curr_cpu_temp) / 2);
analyze_ambient_temp(tp, last_warn, tp->sample_tick);
analyze_cpu_temp(tp, last_warn, tp->sample_tick);
tp->sample_tick++;
}
static enum fan_action prioritize_fan_action(int which_fan)
{
struct bbc_cpu_temperature *tp;
enum fan_action decision = FAN_STATE_MAX;
/* Basically, prioritize what the temperature sensors
* recommend we do, and perform that action on all the
* fans.
*/
list_for_each_entry(tp, &all_temps, glob_list) {
if (tp->fan_todo[which_fan] == FAN_FULLBLAST) {
decision = FAN_FULLBLAST;
break;
}
if (tp->fan_todo[which_fan] == FAN_SAME &&
decision != FAN_FASTER)
decision = FAN_SAME;
else if (tp->fan_todo[which_fan] == FAN_FASTER)
decision = FAN_FASTER;
else if (decision != FAN_FASTER &&
decision != FAN_SAME &&
tp->fan_todo[which_fan] == FAN_SLOWER)
decision = FAN_SLOWER;
}
if (decision == FAN_STATE_MAX)
decision = FAN_SAME;
return decision;
}
static int maybe_new_ambient_fan_speed(struct bbc_fan_control *fp)
{
enum fan_action decision = prioritize_fan_action(FAN_AMBIENT);
int ret;
if (decision == FAN_SAME)
return 0;
ret = 1;
if (decision == FAN_FULLBLAST) {
if (fp->system_fan_speed >= FAN_SPEED_MAX)
ret = 0;
else
fp->system_fan_speed = FAN_SPEED_MAX;
} else {
if (decision == FAN_FASTER) {
if (fp->system_fan_speed >= FAN_SPEED_MAX)
ret = 0;
else
fp->system_fan_speed += 2;
} else {
int orig_speed = fp->system_fan_speed;
if (orig_speed <= FAN_SPEED_MIN ||
orig_speed <= (fp->cpu_fan_speed - 3))
ret = 0;
else
fp->system_fan_speed -= 1;
}
}
return ret;
}
static int maybe_new_cpu_fan_speed(struct bbc_fan_control *fp)
{
enum fan_action decision = prioritize_fan_action(FAN_CPU);
int ret;
if (decision == FAN_SAME)
return 0;
ret = 1;
if (decision == FAN_FULLBLAST) {
if (fp->cpu_fan_speed >= FAN_SPEED_MAX)
ret = 0;
else
fp->cpu_fan_speed = FAN_SPEED_MAX;
} else {
if (decision == FAN_FASTER) {
if (fp->cpu_fan_speed >= FAN_SPEED_MAX)
ret = 0;
else {
fp->cpu_fan_speed += 2;
if (fp->system_fan_speed <
(fp->cpu_fan_speed - 3))
fp->system_fan_speed =
fp->cpu_fan_speed - 3;
}
} else {
if (fp->cpu_fan_speed <= FAN_SPEED_MIN)
ret = 0;
else
fp->cpu_fan_speed -= 1;
}
}
return ret;
}
static void maybe_new_fan_speeds(struct bbc_fan_control *fp)
{
int new;
new = maybe_new_ambient_fan_speed(fp);
new |= maybe_new_cpu_fan_speed(fp);
if (new)
set_fan_speeds(fp);
}
static void fans_full_blast(void)
{
struct bbc_fan_control *fp;
/* Since we will not be monitoring things anymore, put
* the fans on full blast.
*/
list_for_each_entry(fp, &all_fans, glob_list) {
fp->cpu_fan_speed = FAN_SPEED_MAX;
fp->system_fan_speed = FAN_SPEED_MAX;
fp->psupply_fan_on = 1;
set_fan_speeds(fp);
}
}
#define POLL_INTERVAL (5 * 1000)
static unsigned long last_warning_jiffies;
static struct task_struct *kenvctrld_task;
static int kenvctrld(void *__unused)
{
printk(KERN_INFO "bbc_envctrl: kenvctrld starting...\n");
last_warning_jiffies = jiffies - WARN_INTERVAL;
for (;;) {
struct bbc_cpu_temperature *tp;
struct bbc_fan_control *fp;
msleep_interruptible(POLL_INTERVAL);
if (kthread_should_stop())
break;
list_for_each_entry(tp, &all_temps, glob_list) {
get_current_temps(tp);
analyze_temps(tp, &last_warning_jiffies);
}
list_for_each_entry(fp, &all_fans, glob_list)
maybe_new_fan_speeds(fp);
}
printk(KERN_INFO "bbc_envctrl: kenvctrld exiting...\n");
fans_full_blast();
return 0;
}
static void attach_one_temp(struct bbc_i2c_bus *bp, struct platform_device *op,
int temp_idx)
{
struct bbc_cpu_temperature *tp;
tp = kzalloc(sizeof(*tp), GFP_KERNEL);
if (!tp)
return;
INIT_LIST_HEAD(&tp->bp_list);
INIT_LIST_HEAD(&tp->glob_list);
tp->client = bbc_i2c_attach(bp, op);
if (!tp->client) {
kfree(tp);
return;
}
tp->index = temp_idx;
list_add(&tp->glob_list, &all_temps);
list_add(&tp->bp_list, &bp->temps);
/* Tell it to convert once every 5 seconds, clear all cfg
* bits.
*/
bbc_i2c_writeb(tp->client, 0x00, MAX1617_WR_CFG_BYTE);
bbc_i2c_writeb(tp->client, 0x02, MAX1617_WR_CVRATE_BYTE);
/* Program the hard temperature limits into the chip. */
bbc_i2c_writeb(tp->client, amb_temp_limits[tp->index].high_pwroff,
MAX1617_WR_AMB_HIGHLIM);
bbc_i2c_writeb(tp->client, amb_temp_limits[tp->index].low_pwroff,
MAX1617_WR_AMB_LOWLIM);
bbc_i2c_writeb(tp->client, cpu_temp_limits[tp->index].high_pwroff,
MAX1617_WR_CPU_HIGHLIM);
bbc_i2c_writeb(tp->client, cpu_temp_limits[tp->index].low_pwroff,
MAX1617_WR_CPU_LOWLIM);
get_current_temps(tp);
tp->prev_cpu_temp = tp->avg_cpu_temp = tp->curr_cpu_temp;
tp->prev_amb_temp = tp->avg_amb_temp = tp->curr_amb_temp;
tp->fan_todo[FAN_AMBIENT] = FAN_SAME;
tp->fan_todo[FAN_CPU] = FAN_SAME;
}
static void attach_one_fan(struct bbc_i2c_bus *bp, struct platform_device *op,
int fan_idx)
{
struct bbc_fan_control *fp;
fp = kzalloc(sizeof(*fp), GFP_KERNEL);
if (!fp)
return;
INIT_LIST_HEAD(&fp->bp_list);
INIT_LIST_HEAD(&fp->glob_list);
fp->client = bbc_i2c_attach(bp, op);
if (!fp->client) {
kfree(fp);
return;
}
fp->index = fan_idx;
list_add(&fp->glob_list, &all_fans);
list_add(&fp->bp_list, &bp->fans);
/* The i2c device controlling the fans is write-only.
* So the only way to keep track of the current power
* level fed to the fans is via software. Choose half
* power for cpu/system and 'on' fo the powersupply fan
* and set it now.
*/
fp->psupply_fan_on = 1;
fp->cpu_fan_speed = (FAN_SPEED_MAX - FAN_SPEED_MIN) / 2;
fp->cpu_fan_speed += FAN_SPEED_MIN;
fp->system_fan_speed = (FAN_SPEED_MAX - FAN_SPEED_MIN) / 2;
fp->system_fan_speed += FAN_SPEED_MIN;
set_fan_speeds(fp);
}
static void destroy_one_temp(struct bbc_cpu_temperature *tp)
{
bbc_i2c_detach(tp->client);
kfree(tp);
}
static void destroy_all_temps(struct bbc_i2c_bus *bp)
{
struct bbc_cpu_temperature *tp, *tpos;
list_for_each_entry_safe(tp, tpos, &bp->temps, bp_list) {
list_del(&tp->bp_list);
list_del(&tp->glob_list);
destroy_one_temp(tp);
}
}
static void destroy_one_fan(struct bbc_fan_control *fp)
{
bbc_i2c_detach(fp->client);
kfree(fp);
}
static void destroy_all_fans(struct bbc_i2c_bus *bp)
{
struct bbc_fan_control *fp, *fpos;
list_for_each_entry_safe(fp, fpos, &bp->fans, bp_list) {
list_del(&fp->bp_list);
list_del(&fp->glob_list);
destroy_one_fan(fp);
}
}
int bbc_envctrl_init(struct bbc_i2c_bus *bp)
{
struct platform_device *op;
int temp_index = 0;
int fan_index = 0;
int devidx = 0;
while ((op = bbc_i2c_getdev(bp, devidx++)) != NULL) {
if (!strcmp(op->dev.of_node->name, "temperature"))
attach_one_temp(bp, op, temp_index++);
if (!strcmp(op->dev.of_node->name, "fan-control"))
attach_one_fan(bp, op, fan_index++);
}
if (temp_index != 0 && fan_index != 0) {
kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld");
if (IS_ERR(kenvctrld_task)) {
int err = PTR_ERR(kenvctrld_task);
kenvctrld_task = NULL;
destroy_all_temps(bp);
destroy_all_fans(bp);
return err;
}
}
return 0;
}
void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp)
{
if (kenvctrld_task)
kthread_stop(kenvctrld_task);
destroy_all_temps(bp);
destroy_all_fans(bp);
}