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linux-next/drivers/macintosh/windfarm_pm121.c
Rickard Strandqvist bd0c30e310 macintosh/windfarm_pm121.c: Fix for possible null pointer dereference 
There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-20 10:56:00 +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;
if(control)
{
pid_param.min = control->ops->get_min(control);
pid_param.max = control->ops->get_max(control);
} else {
/*
* This is probably not the right!?
* Perhaps goto fail if control == NULL above?
*/
pid_param.min = 0;
pid_param.max = 0;
}
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 ? control->name : "uninitialized value");
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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