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linux-next/drivers/macintosh/windfarm_pm121.c
Aaro Koskinen 4bb2971134 powerpc/windfarm: Fix overtemperature clearing 
With pm81/pm91/pm121, when the overtemperature state is entered, and
when it remains on after skipped ticks, the driver will try to leave
it too soon (immediately on the next tick). This is because the active
FAILURE_OVERTEMP state is not visible in "new_failure" variable of the
current tick. Furthermore, the driver will keep trying to clear condition
in subsequent ticks as FAILURE_OVERTEMP remains set in the "last_failure"
variable. These will start to trigger WARNINGS from windfarm core:

[  100.082735] windfarm: Clamping CPU frequency to minimum !
[  100.108132] windfarm: Overtemp condition detected !
[  101.952908] windfarm: Overtemp condition cleared !
[...]
[  102.980388] WARNING: at drivers/macintosh/windfarm_core.c:463
[...]
[  103.982227] WARNING: at drivers/macintosh/windfarm_core.c:463
[...]
[  105.030494] WARNING: at drivers/macintosh/windfarm_core.c:463
[...]
[  105.973666] WARNING: at drivers/macintosh/windfarm_core.c:463
[...]
[  106.977913] WARNING: at drivers/macintosh/windfarm_core.c:463

Fix by adding a helper global variable. We leave the overtemp state only
after all failure bits have been cleared.

I saw this error on iMac G5 iSight (pm121). Also pm81/pm91 are fixed
based on the observation that these are almost identical/copy-pasted code.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-07-01 11:10:34 +10:00

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/*
* Windfarm PowerMac thermal control. iMac G5 iSight
*
* (c) Copyright 2007 Étienne Bersac <bersace@gmail.com>
*
* Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin
* Herrenschmidt, IBM Corp. <benh@kernel.crashing.org>
*
* Released under the term of the GNU GPL v2.
*
*
*
* PowerMac12,1
* ============
*
*
* The algorithm used is the PID control algorithm, used the same way
* the published Darwin code does, using the same values that are
* present in the Darwin 8.10 snapshot property lists (note however
* that none of the code has been re-used, it's a complete
* re-implementation
*
* There is two models using PowerMac12,1. Model 2 is iMac G5 iSight
* 17" while Model 3 is iMac G5 20". They do have both the same
* controls with a tiny difference. The control-ids of hard-drive-fan
* and cpu-fan is swapped.
*
*
* Target Correction :
*
* controls have a target correction calculated as :
*
* new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value
* new_value = max(new_value, max(new_min, 0))
*
* OD Fan control correction.
*
* # model_id: 2
* offset : -19563152
* slope : 1956315
*
* # model_id: 3
* offset : -15650652
* slope : 1565065
*
* HD Fan control correction.
*
* # model_id: 2
* offset : -15650652
* slope : 1565065
*
* # model_id: 3
* offset : -19563152
* slope : 1956315
*
* CPU Fan control correction.
*
* # model_id: 2
* offset : -25431900
* slope : 2543190
*
* # model_id: 3
* offset : -15650652
* slope : 1565065
*
*
* Target rubber-banding :
*
* Some controls have a target correction which depends on another
* control value. The correction is computed in the following way :
*
* new_min = ref_value * slope + offset
*
* ref_value is the value of the reference control. If new_min is
* greater than 0, then we correct the target value using :
*
* new_target = max (new_target, new_min >> 16)
*
*
* # model_id : 2
* control : cpu-fan
* ref : optical-drive-fan
* offset : -15650652
* slope : 1565065
*
* # model_id : 3
* control : optical-drive-fan
* ref : hard-drive-fan
* offset : -32768000
* slope : 65536
*
*
* In order to have the moste efficient correction with those
* dependencies, we must trigger HD loop before OD loop before CPU
* loop.
*
*
* The various control loops found in Darwin config file are:
*
* HD Fan control loop.
*
* # model_id: 2
* control : hard-drive-fan
* sensor : hard-drive-temp
* PID params : G_d = 0x00000000
* G_p = 0x002D70A3
* G_r = 0x00019999
* History = 2 entries
* Input target = 0x370000
* Interval = 5s
*
* # model_id: 3
* control : hard-drive-fan
* sensor : hard-drive-temp
* PID params : G_d = 0x00000000
* G_p = 0x002170A3
* G_r = 0x00019999
* History = 2 entries
* Input target = 0x370000
* Interval = 5s
*
* OD Fan control loop.
*
* # model_id: 2
* control : optical-drive-fan
* sensor : optical-drive-temp
* PID params : G_d = 0x00000000
* G_p = 0x001FAE14
* G_r = 0x00019999
* History = 2 entries
* Input target = 0x320000
* Interval = 5s
*
* # model_id: 3
* control : optical-drive-fan
* sensor : optical-drive-temp
* PID params : G_d = 0x00000000
* G_p = 0x001FAE14
* G_r = 0x00019999
* History = 2 entries
* Input target = 0x320000
* Interval = 5s
*
* GPU Fan control loop.
*
* # model_id: 2
* control : hard-drive-fan
* sensor : gpu-temp
* PID params : G_d = 0x00000000
* G_p = 0x002A6666
* G_r = 0x00019999
* History = 2 entries
* Input target = 0x5A0000
* Interval = 5s
*
* # model_id: 3
* control : cpu-fan
* sensor : gpu-temp
* PID params : G_d = 0x00000000
* G_p = 0x0010CCCC
* G_r = 0x00019999
* History = 2 entries
* Input target = 0x500000
* Interval = 5s
*
* KODIAK (aka northbridge) Fan control loop.
*
* # model_id: 2
* control : optical-drive-fan
* sensor : north-bridge-temp
* PID params : G_d = 0x00000000
* G_p = 0x003BD70A
* G_r = 0x00019999
* History = 2 entries
* Input target = 0x550000
* Interval = 5s
*
* # model_id: 3
* control : hard-drive-fan
* sensor : north-bridge-temp
* PID params : G_d = 0x00000000
* G_p = 0x0030F5C2
* G_r = 0x00019999
* History = 2 entries
* Input target = 0x550000
* Interval = 5s
*
* CPU Fan control loop.
*
* control : cpu-fan
* sensors : cpu-temp, cpu-power
* PID params : from SDB partition
*
*
* CPU Slew control loop.
*
* control : cpufreq-clamp
* sensor : cpu-temp
*
*/
#undef DEBUG
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/kmod.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/smu.h>
#include "windfarm.h"
#include "windfarm_pid.h"
#define VERSION "0.3"
static int pm121_mach_model; /* machine model id */
/* Controls & sensors */
static struct wf_sensor *sensor_cpu_power;
static struct wf_sensor *sensor_cpu_temp;
static struct wf_sensor *sensor_cpu_voltage;
static struct wf_sensor *sensor_cpu_current;
static struct wf_sensor *sensor_gpu_temp;
static struct wf_sensor *sensor_north_bridge_temp;
static struct wf_sensor *sensor_hard_drive_temp;
static struct wf_sensor *sensor_optical_drive_temp;
static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */
enum {
FAN_CPU,
FAN_HD,
FAN_OD,
CPUFREQ,
N_CONTROLS
};
static struct wf_control *controls[N_CONTROLS] = {};
/* Set to kick the control loop into life */
static int pm121_all_controls_ok, pm121_all_sensors_ok, pm121_started;
enum {
FAILURE_FAN = 1 << 0,
FAILURE_SENSOR = 1 << 1,
FAILURE_OVERTEMP = 1 << 2
};
/* All sys loops. Note the HD before the OD loop in order to have it
run before. */
enum {
LOOP_GPU, /* control = hd or cpu, but luckily,
it doesn't matter */
LOOP_HD, /* control = hd */
LOOP_KODIAK, /* control = hd or od */
LOOP_OD, /* control = od */
N_LOOPS
};
static const char *loop_names[N_LOOPS] = {
"GPU",
"HD",
"KODIAK",
"OD",
};
#define PM121_NUM_CONFIGS 2
static unsigned int pm121_failure_state;
static int pm121_readjust, pm121_skipping;
static bool pm121_overtemp;
static s32 average_power;
struct pm121_correction {
int offset;
int slope;
};
static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = {
/* FAN_OD */
{
/* MODEL 2 */
{ .offset = -19563152,
.slope = 1956315
},
/* MODEL 3 */
{ .offset = -15650652,
.slope = 1565065
},
},
/* FAN_HD */
{
/* MODEL 2 */
{ .offset = -15650652,
.slope = 1565065
},
/* MODEL 3 */
{ .offset = -19563152,
.slope = 1956315
},
},
/* FAN_CPU */
{
/* MODEL 2 */
{ .offset = -25431900,
.slope = 2543190
},
/* MODEL 3 */
{ .offset = -15650652,
.slope = 1565065
},
},
/* CPUFREQ has no correction (and is not implemented at all) */
};
struct pm121_connection {
unsigned int control_id;
unsigned int ref_id;
struct pm121_correction correction;
};
static struct pm121_connection pm121_connections[] = {
/* MODEL 2 */
{ .control_id = FAN_CPU,
.ref_id = FAN_OD,
{ .offset = -32768000,
.slope = 65536
}
},
/* MODEL 3 */
{ .control_id = FAN_OD,
.ref_id = FAN_HD,
{ .offset = -32768000,
.slope = 65536
}
},
};
/* pointer to the current model connection */
static struct pm121_connection *pm121_connection;
/*
* ****** System Fans Control Loop ******
*
*/
/* Since each loop handles only one control and we want to avoid
* writing virtual control, we store the control correction with the
* loop params. Some data are not set, there are common to all loop
* and thus, hardcoded.
*/
struct pm121_sys_param {
/* purely informative since we use mach_model-2 as index */
int model_id;
struct wf_sensor **sensor; /* use sensor_id instead ? */
s32 gp, itarget;
unsigned int control_id;
};
static struct pm121_sys_param
pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = {
/* GPU Fan control loop */
{
{ .model_id = 2,
.sensor = &sensor_gpu_temp,
.gp = 0x002A6666,
.itarget = 0x5A0000,
.control_id = FAN_HD,
},
{ .model_id = 3,
.sensor = &sensor_gpu_temp,
.gp = 0x0010CCCC,
.itarget = 0x500000,
.control_id = FAN_CPU,
},
},
/* HD Fan control loop */
{
{ .model_id = 2,
.sensor = &sensor_hard_drive_temp,
.gp = 0x002D70A3,
.itarget = 0x370000,
.control_id = FAN_HD,
},
{ .model_id = 3,
.sensor = &sensor_hard_drive_temp,
.gp = 0x002170A3,
.itarget = 0x370000,
.control_id = FAN_HD,
},
},
/* KODIAK Fan control loop */
{
{ .model_id = 2,
.sensor = &sensor_north_bridge_temp,
.gp = 0x003BD70A,
.itarget = 0x550000,
.control_id = FAN_OD,
},
{ .model_id = 3,
.sensor = &sensor_north_bridge_temp,
.gp = 0x0030F5C2,
.itarget = 0x550000,
.control_id = FAN_HD,
},
},
/* OD Fan control loop */
{
{ .model_id = 2,
.sensor = &sensor_optical_drive_temp,
.gp = 0x001FAE14,
.itarget = 0x320000,
.control_id = FAN_OD,
},
{ .model_id = 3,
.sensor = &sensor_optical_drive_temp,
.gp = 0x001FAE14,
.itarget = 0x320000,
.control_id = FAN_OD,
},
},
};
/* the hardcoded values */
#define PM121_SYS_GD 0x00000000
#define PM121_SYS_GR 0x00019999
#define PM121_SYS_HISTORY_SIZE 2
#define PM121_SYS_INTERVAL 5
/* State data used by the system fans control loop
*/
struct pm121_sys_state {
int ticks;
s32 setpoint;
struct wf_pid_state pid;
};
struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
/*
* ****** CPU Fans Control Loop ******
*
*/
#define PM121_CPU_INTERVAL 1
/* State data used by the cpu fans control loop
*/
struct pm121_cpu_state {
int ticks;
s32 setpoint;
struct wf_cpu_pid_state pid;
};
static struct pm121_cpu_state *pm121_cpu_state;
/*
* ***** Implementation *****
*
*/
/* correction the value using the output-low-bound correction algo */
static s32 pm121_correct(s32 new_setpoint,
unsigned int control_id,
s32 min)
{
s32 new_min;
struct pm121_correction *correction;
correction = &corrections[control_id][pm121_mach_model - 2];
new_min = (average_power * correction->slope) >> 16;
new_min += correction->offset;
new_min = (new_min >> 16) + min;
return max3(new_setpoint, new_min, 0);
}
static s32 pm121_connect(unsigned int control_id, s32 setpoint)
{
s32 new_min, value, new_setpoint;
if (pm121_connection->control_id == control_id) {
controls[control_id]->ops->get_value(controls[control_id],
&value);
new_min = value * pm121_connection->correction.slope;
new_min += pm121_connection->correction.offset;
if (new_min > 0) {
new_setpoint = max(setpoint, (new_min >> 16));
if (new_setpoint != setpoint) {
pr_debug("pm121: %s depending on %s, "
"corrected from %d to %d RPM\n",
controls[control_id]->name,
controls[pm121_connection->ref_id]->name,
(int) setpoint, (int) new_setpoint);
}
} else
new_setpoint = setpoint;
}
/* no connection */
else
new_setpoint = setpoint;
return new_setpoint;
}
/* FAN LOOPS */
static void pm121_create_sys_fans(int loop_id)
{
struct pm121_sys_param *param = NULL;
struct wf_pid_param pid_param;
struct wf_control *control = NULL;
int i;
/* First, locate the params for this model */
for (i = 0; i < PM121_NUM_CONFIGS; i++) {
if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) {
param = &(pm121_sys_all_params[loop_id][i]);
break;
}
}
/* No params found, put fans to max */
if (param == NULL) {
printk(KERN_WARNING "pm121: %s fan config not found "
" for this machine model\n",
loop_names[loop_id]);
goto fail;
}
control = controls[param->control_id];
/* Alloc & initialize state */
pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state),
GFP_KERNEL);
if (pm121_sys_state[loop_id] == NULL) {
printk(KERN_WARNING "pm121: Memory allocation error\n");
goto fail;
}
pm121_sys_state[loop_id]->ticks = 1;
/* Fill PID params */
pid_param.gd = PM121_SYS_GD;
pid_param.gp = param->gp;
pid_param.gr = PM121_SYS_GR;
pid_param.interval = PM121_SYS_INTERVAL;
pid_param.history_len = PM121_SYS_HISTORY_SIZE;
pid_param.itarget = param->itarget;
pid_param.min = control->ops->get_min(control);
pid_param.max = control->ops->get_max(control);
wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param);
pr_debug("pm121: %s Fan control loop initialized.\n"
" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
loop_names[loop_id], FIX32TOPRINT(pid_param.itarget),
pid_param.min, pid_param.max);
return;
fail:
/* note that this is not optimal since another loop may still
control the same control */
printk(KERN_WARNING "pm121: failed to set up %s loop "
"setting \"%s\" to max speed.\n",
loop_names[loop_id], control->name);
if (control)
wf_control_set_max(control);
}
static void pm121_sys_fans_tick(int loop_id)
{
struct pm121_sys_param *param;
struct pm121_sys_state *st;
struct wf_sensor *sensor;
struct wf_control *control;
s32 temp, new_setpoint;
int rc;
param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]);
st = pm121_sys_state[loop_id];
sensor = *(param->sensor);
control = controls[param->control_id];
if (--st->ticks != 0) {
if (pm121_readjust)
goto readjust;
return;
}
st->ticks = PM121_SYS_INTERVAL;
rc = sensor->ops->get_value(sensor, &temp);
if (rc) {
printk(KERN_WARNING "windfarm: %s sensor error %d\n",
sensor->name, rc);
pm121_failure_state |= FAILURE_SENSOR;
return;
}
pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n",
loop_names[loop_id], sensor->name,
FIX32TOPRINT(temp));
new_setpoint = wf_pid_run(&st->pid, temp);
/* correction */
new_setpoint = pm121_correct(new_setpoint,
param->control_id,
st->pid.param.min);
/* linked corretion */
new_setpoint = pm121_connect(param->control_id, new_setpoint);
if (new_setpoint == st->setpoint)
return;
st->setpoint = new_setpoint;
pr_debug("pm121: %s corrected setpoint: %d RPM\n",
control->name, (int)new_setpoint);
readjust:
if (control && pm121_failure_state == 0) {
rc = control->ops->set_value(control, st->setpoint);
if (rc) {
printk(KERN_WARNING "windfarm: %s fan error %d\n",
control->name, rc);
pm121_failure_state |= FAILURE_FAN;
}
}
}
/* CPU LOOP */
static void pm121_create_cpu_fans(void)
{
struct wf_cpu_pid_param pid_param;
const struct smu_sdbp_header *hdr;
struct smu_sdbp_cpupiddata *piddata;
struct smu_sdbp_fvt *fvt;
struct wf_control *fan_cpu;
s32 tmax, tdelta, maxpow, powadj;
fan_cpu = controls[FAN_CPU];
/* First, locate the PID params in SMU SBD */
hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
if (hdr == 0) {
printk(KERN_WARNING "pm121: CPU PID fan config not found.\n");
goto fail;
}
piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
/* Get the FVT params for operating point 0 (the only supported one
* for now) in order to get tmax
*/
hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
if (hdr) {
fvt = (struct smu_sdbp_fvt *)&hdr[1];
tmax = ((s32)fvt->maxtemp) << 16;
} else
tmax = 0x5e0000; /* 94 degree default */
/* Alloc & initialize state */
pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state),
GFP_KERNEL);
if (pm121_cpu_state == NULL)
goto fail;
pm121_cpu_state->ticks = 1;
/* Fill PID params */
pid_param.interval = PM121_CPU_INTERVAL;
pid_param.history_len = piddata->history_len;
if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
printk(KERN_WARNING "pm121: History size overflow on "
"CPU control loop (%d)\n", piddata->history_len);
pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
}
pid_param.gd = piddata->gd;
pid_param.gp = piddata->gp;
pid_param.gr = piddata->gr / pid_param.history_len;
tdelta = ((s32)piddata->target_temp_delta) << 16;
maxpow = ((s32)piddata->max_power) << 16;
powadj = ((s32)piddata->power_adj) << 16;
pid_param.tmax = tmax;
pid_param.ttarget = tmax - tdelta;
pid_param.pmaxadj = maxpow - powadj;
pid_param.min = fan_cpu->ops->get_min(fan_cpu);
pid_param.max = fan_cpu->ops->get_max(fan_cpu);
wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param);
pr_debug("pm121: CPU Fan control initialized.\n");
pr_debug(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n",
FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
pid_param.min, pid_param.max);
return;
fail:
printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n");
if (controls[CPUFREQ])
wf_control_set_max(controls[CPUFREQ]);
if (fan_cpu)
wf_control_set_max(fan_cpu);
}
static void pm121_cpu_fans_tick(struct pm121_cpu_state *st)
{
s32 new_setpoint, temp, power;
struct wf_control *fan_cpu = NULL;
int rc;
if (--st->ticks != 0) {
if (pm121_readjust)
goto readjust;
return;
}
st->ticks = PM121_CPU_INTERVAL;
fan_cpu = controls[FAN_CPU];
rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
if (rc) {
printk(KERN_WARNING "pm121: CPU temp sensor error %d\n",
rc);
pm121_failure_state |= FAILURE_SENSOR;
return;
}
rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
if (rc) {
printk(KERN_WARNING "pm121: CPU power sensor error %d\n",
rc);
pm121_failure_state |= FAILURE_SENSOR;
return;
}
pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n",
FIX32TOPRINT(temp), FIX32TOPRINT(power));
if (temp > st->pid.param.tmax)
pm121_failure_state |= FAILURE_OVERTEMP;
new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
/* correction */
new_setpoint = pm121_correct(new_setpoint,
FAN_CPU,
st->pid.param.min);
/* connected correction */
new_setpoint = pm121_connect(FAN_CPU, new_setpoint);
if (st->setpoint == new_setpoint)
return;
st->setpoint = new_setpoint;
pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint);
readjust:
if (fan_cpu && pm121_failure_state == 0) {
rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint);
if (rc) {
printk(KERN_WARNING "pm121: %s fan error %d\n",
fan_cpu->name, rc);
pm121_failure_state |= FAILURE_FAN;
}
}
}
/*
* ****** Common ******
*
*/
static void pm121_tick(void)
{
unsigned int last_failure = pm121_failure_state;
unsigned int new_failure;
s32 total_power;
int i;
if (!pm121_started) {
pr_debug("pm121: creating control loops !\n");
for (i = 0; i < N_LOOPS; i++)
pm121_create_sys_fans(i);
pm121_create_cpu_fans();
pm121_started = 1;
}
/* skipping ticks */
if (pm121_skipping && --pm121_skipping)
return;
/* compute average power */
total_power = 0;
for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++)
total_power += pm121_cpu_state->pid.powers[i];
average_power = total_power / pm121_cpu_state->pid.param.history_len;
pm121_failure_state = 0;
for (i = 0 ; i < N_LOOPS; i++) {
if (pm121_sys_state[i])
pm121_sys_fans_tick(i);
}
if (pm121_cpu_state)
pm121_cpu_fans_tick(pm121_cpu_state);
pm121_readjust = 0;
new_failure = pm121_failure_state & ~last_failure;
/* If entering failure mode, clamp cpufreq and ramp all
* fans to full speed.
*/
if (pm121_failure_state && !last_failure) {
for (i = 0; i < N_CONTROLS; i++) {
if (controls[i])
wf_control_set_max(controls[i]);
}
}
/* If leaving failure mode, unclamp cpufreq and readjust
* all fans on next iteration
*/
if (!pm121_failure_state && last_failure) {
if (controls[CPUFREQ])
wf_control_set_min(controls[CPUFREQ]);
pm121_readjust = 1;
}
/* Overtemp condition detected, notify and start skipping a couple
* ticks to let the temperature go down
*/
if (new_failure & FAILURE_OVERTEMP) {
wf_set_overtemp();
pm121_skipping = 2;
pm121_overtemp = true;
}
/* We only clear the overtemp condition if overtemp is cleared
* _and_ no other failure is present. Since a sensor error will
* clear the overtemp condition (can't measure temperature) at
* the control loop levels, but we don't want to keep it clear
* here in this case
*/
if (!pm121_failure_state && pm121_overtemp) {
wf_clear_overtemp();
pm121_overtemp = false;
}
}
static struct wf_control* pm121_register_control(struct wf_control *ct,
const char *match,
unsigned int id)
{
if (controls[id] == NULL && !strcmp(ct->name, match)) {
if (wf_get_control(ct) == 0)
controls[id] = ct;
}
return controls[id];
}
static void pm121_new_control(struct wf_control *ct)
{
int all = 1;
if (pm121_all_controls_ok)
return;
all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all;
all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all;
all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all;
all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all;
if (all)
pm121_all_controls_ok = 1;
}
static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor,
const char *match,
struct wf_sensor **var)
{
if (*var == NULL && !strcmp(sensor->name, match)) {
if (wf_get_sensor(sensor) == 0)
*var = sensor;
}
return *var;
}
static void pm121_new_sensor(struct wf_sensor *sr)
{
int all = 1;
if (pm121_all_sensors_ok)
return;
all = pm121_register_sensor(sr, "cpu-temp",
&sensor_cpu_temp) && all;
all = pm121_register_sensor(sr, "cpu-current",
&sensor_cpu_current) && all;
all = pm121_register_sensor(sr, "cpu-voltage",
&sensor_cpu_voltage) && all;
all = pm121_register_sensor(sr, "cpu-power",
&sensor_cpu_power) && all;
all = pm121_register_sensor(sr, "hard-drive-temp",
&sensor_hard_drive_temp) && all;
all = pm121_register_sensor(sr, "optical-drive-temp",
&sensor_optical_drive_temp) && all;
all = pm121_register_sensor(sr, "incoming-air-temp",
&sensor_incoming_air_temp) && all;
all = pm121_register_sensor(sr, "north-bridge-temp",
&sensor_north_bridge_temp) && all;
all = pm121_register_sensor(sr, "gpu-temp",
&sensor_gpu_temp) && all;
if (all)
pm121_all_sensors_ok = 1;
}
static int pm121_notify(struct notifier_block *self,
unsigned long event, void *data)
{
switch (event) {
case WF_EVENT_NEW_CONTROL:
pr_debug("pm121: new control %s detected\n",
((struct wf_control *)data)->name);
pm121_new_control(data);
break;
case WF_EVENT_NEW_SENSOR:
pr_debug("pm121: new sensor %s detected\n",
((struct wf_sensor *)data)->name);
pm121_new_sensor(data);
break;
case WF_EVENT_TICK:
if (pm121_all_controls_ok && pm121_all_sensors_ok)
pm121_tick();
break;
}
return 0;
}
static struct notifier_block pm121_events = {
.notifier_call = pm121_notify,
};
static int pm121_init_pm(void)
{
const struct smu_sdbp_header *hdr;
hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
if (hdr != 0) {
struct smu_sdbp_sensortree *st =
(struct smu_sdbp_sensortree *)&hdr[1];
pm121_mach_model = st->model_id;
}
pm121_connection = &pm121_connections[pm121_mach_model - 2];
printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n",
pm121_mach_model);
return 0;
}
static int pm121_probe(struct platform_device *ddev)
{
wf_register_client(&pm121_events);
return 0;
}
static int pm121_remove(struct platform_device *ddev)
{
wf_unregister_client(&pm121_events);
return 0;
}
static struct platform_driver pm121_driver = {
.probe = pm121_probe,
.remove = pm121_remove,
.driver = {
.name = "windfarm",
.bus = &platform_bus_type,
},
};
static int __init pm121_init(void)
{
int rc = -ENODEV;
if (of_machine_is_compatible("PowerMac12,1"))
rc = pm121_init_pm();
if (rc == 0) {
request_module("windfarm_smu_controls");
request_module("windfarm_smu_sensors");
request_module("windfarm_smu_sat");
request_module("windfarm_lm75_sensor");
request_module("windfarm_max6690_sensor");
request_module("windfarm_cpufreq_clamp");
platform_driver_register(&pm121_driver);
}
return rc;
}
static void __exit pm121_exit(void)
{
platform_driver_unregister(&pm121_driver);
}
module_init(pm121_init);
module_exit(pm121_exit);
MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>");
MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
MODULE_LICENSE("GPL");
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