| /* |
| * Windfarm PowerMac thermal control. iMac G5 |
| * |
| * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. |
| * <benh@kernel.crashing.org> |
| * |
| * Released under the term of the GNU GPL v2. |
| * |
| * 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 8.2 snapshot property lists (note however |
| * that none of the code has been re-used, it's a complete re-implementation |
| * |
| * The various control loops found in Darwin config file are: |
| * |
| * PowerMac8,1 and PowerMac8,2 |
| * =========================== |
| * |
| * System Fans control loop. Different based on models. In addition to the |
| * usual PID algorithm, the control loop gets 2 additional pairs of linear |
| * scaling factors (scale/offsets) expressed as 4.12 fixed point values |
| * signed offset, unsigned scale) |
| * |
| * The targets are modified such as: |
| * - the linked control (second control) gets the target value as-is |
| * (typically the drive fan) |
| * - the main control (first control) gets the target value scaled with |
| * the first pair of factors, and is then modified as below |
| * - the value of the target of the CPU Fan control loop is retrieved, |
| * scaled with the second pair of factors, and the max of that and |
| * the scaled target is applied to the main control. |
| * |
| * # model_id: 2 |
| * controls : system-fan, drive-bay-fan |
| * sensors : hd-temp |
| * PID params : G_d = 0x15400000 |
| * G_p = 0x00200000 |
| * G_r = 0x000002fd |
| * History = 2 entries |
| * Input target = 0x3a0000 |
| * Interval = 5s |
| * linear-factors : offset = 0xff38 scale = 0x0ccd |
| * offset = 0x0208 scale = 0x07ae |
| * |
| * # model_id: 3 |
| * controls : system-fan, drive-bay-fan |
| * sensors : hd-temp |
| * PID params : G_d = 0x08e00000 |
| * G_p = 0x00566666 |
| * G_r = 0x0000072b |
| * History = 2 entries |
| * Input target = 0x350000 |
| * Interval = 5s |
| * linear-factors : offset = 0xff38 scale = 0x0ccd |
| * offset = 0x0000 scale = 0x0000 |
| * |
| * # model_id: 5 |
| * controls : system-fan |
| * sensors : hd-temp |
| * PID params : G_d = 0x15400000 |
| * G_p = 0x00233333 |
| * G_r = 0x000002fd |
| * History = 2 entries |
| * Input target = 0x3a0000 |
| * Interval = 5s |
| * linear-factors : offset = 0x0000 scale = 0x1000 |
| * offset = 0x0091 scale = 0x0bae |
| * |
| * CPU Fan control loop. The loop is identical for all models. it |
| * has an additional pair of scaling factor. This is used to scale the |
| * systems fan control loop target result (the one before it gets scaled |
| * by the System Fans control loop itself). Then, the max value of the |
| * calculated target value and system fan value is sent to the fans |
| * |
| * controls : cpu-fan |
| * sensors : cpu-temp cpu-power |
| * PID params : From SMU sdb partition |
| * linear-factors : offset = 0xfb50 scale = 0x1000 |
| * |
| * CPU Slew control loop. Not implemented. The cpufreq driver in linux is |
| * completely separate for now, though we could find a way to link it, either |
| * as a client reacting to overtemp notifications, or directling monitoring |
| * the CPU temperature |
| * |
| * WARNING ! The CPU control loop requires the CPU tmax for the current |
| * operating point. However, we currently are completely separated from |
| * the cpufreq driver and thus do not know what the current operating |
| * point is. Fortunately, we also do not have any hardware supporting anything |
| * but operating point 0 at the moment, thus we just peek that value directly |
| * from the SDB partition. If we ever end up with actually slewing the system |
| * clock and thus changing operating points, we'll have to find a way to |
| * communicate with the CPU freq driver; |
| * |
| */ |
| |
| #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/system.h> |
| #include <asm/sections.h> |
| #include <asm/smu.h> |
| |
| #include "windfarm.h" |
| #include "windfarm_pid.h" |
| |
| #define VERSION "0.4" |
| |
| #undef DEBUG |
| |
| #ifdef DEBUG |
| #define DBG(args...) printk(args) |
| #else |
| #define DBG(args...) do { } while(0) |
| #endif |
| |
| /* define this to force CPU overtemp to 74 degree, useful for testing |
| * the overtemp code |
| */ |
| #undef HACKED_OVERTEMP |
| |
| static int wf_smu_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_hd_temp; |
| static struct wf_control *fan_cpu_main; |
| static struct wf_control *fan_hd; |
| static struct wf_control *fan_system; |
| static struct wf_control *cpufreq_clamp; |
| |
| /* Set to kick the control loop into life */ |
| static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started; |
| |
| /* Failure handling.. could be nicer */ |
| #define FAILURE_FAN 0x01 |
| #define FAILURE_SENSOR 0x02 |
| #define FAILURE_OVERTEMP 0x04 |
| |
| static unsigned int wf_smu_failure_state; |
| static int wf_smu_readjust, wf_smu_skipping; |
| |
| /* |
| * ****** System Fans Control Loop ****** |
| * |
| */ |
| |
| /* Parameters for the System Fans control loop. Parameters |
| * not in this table such as interval, history size, ... |
| * are common to all versions and thus hard coded for now. |
| */ |
| struct wf_smu_sys_fans_param { |
| int model_id; |
| s32 itarget; |
| s32 gd, gp, gr; |
| |
| s16 offset0; |
| u16 scale0; |
| s16 offset1; |
| u16 scale1; |
| }; |
| |
| #define WF_SMU_SYS_FANS_INTERVAL 5 |
| #define WF_SMU_SYS_FANS_HISTORY_SIZE 2 |
| |
| /* State data used by the system fans control loop |
| */ |
| struct wf_smu_sys_fans_state { |
| int ticks; |
| s32 sys_setpoint; |
| s32 hd_setpoint; |
| s16 offset0; |
| u16 scale0; |
| s16 offset1; |
| u16 scale1; |
| struct wf_pid_state pid; |
| }; |
| |
| /* |
| * Configs for SMU Sytem Fan control loop |
| */ |
| static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = { |
| /* Model ID 2 */ |
| { |
| .model_id = 2, |
| .itarget = 0x3a0000, |
| .gd = 0x15400000, |
| .gp = 0x00200000, |
| .gr = 0x000002fd, |
| .offset0 = 0xff38, |
| .scale0 = 0x0ccd, |
| .offset1 = 0x0208, |
| .scale1 = 0x07ae, |
| }, |
| /* Model ID 3 */ |
| { |
| .model_id = 3, |
| .itarget = 0x350000, |
| .gd = 0x08e00000, |
| .gp = 0x00566666, |
| .gr = 0x0000072b, |
| .offset0 = 0xff38, |
| .scale0 = 0x0ccd, |
| .offset1 = 0x0000, |
| .scale1 = 0x0000, |
| }, |
| /* Model ID 5 */ |
| { |
| .model_id = 5, |
| .itarget = 0x3a0000, |
| .gd = 0x15400000, |
| .gp = 0x00233333, |
| .gr = 0x000002fd, |
| .offset0 = 0x0000, |
| .scale0 = 0x1000, |
| .offset1 = 0x0091, |
| .scale1 = 0x0bae, |
| }, |
| }; |
| #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params) |
| |
| static struct wf_smu_sys_fans_state *wf_smu_sys_fans; |
| |
| /* |
| * ****** CPU Fans Control Loop ****** |
| * |
| */ |
| |
| |
| #define WF_SMU_CPU_FANS_INTERVAL 1 |
| #define WF_SMU_CPU_FANS_MAX_HISTORY 16 |
| #define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000 |
| #define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50 |
| |
| /* State data used by the cpu fans control loop |
| */ |
| struct wf_smu_cpu_fans_state { |
| int ticks; |
| s32 cpu_setpoint; |
| s32 scale; |
| s32 offset; |
| struct wf_cpu_pid_state pid; |
| }; |
| |
| static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; |
| |
| |
| |
| /* |
| * ***** Implementation ***** |
| * |
| */ |
| |
| static void wf_smu_create_sys_fans(void) |
| { |
| struct wf_smu_sys_fans_param *param = NULL; |
| struct wf_pid_param pid_param; |
| int i; |
| |
| /* First, locate the params for this model */ |
| for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++) |
| if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) { |
| param = &wf_smu_sys_all_params[i]; |
| break; |
| } |
| |
| /* No params found, put fans to max */ |
| if (param == NULL) { |
| printk(KERN_WARNING "windfarm: System fan config not found " |
| "for this machine model, max fan speed\n"); |
| goto fail; |
| } |
| |
| /* Alloc & initialize state */ |
| wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state), |
| GFP_KERNEL); |
| if (wf_smu_sys_fans == NULL) { |
| printk(KERN_WARNING "windfarm: Memory allocation error" |
| " max fan speed\n"); |
| goto fail; |
| } |
| wf_smu_sys_fans->ticks = 1; |
| wf_smu_sys_fans->scale0 = param->scale0; |
| wf_smu_sys_fans->offset0 = param->offset0; |
| wf_smu_sys_fans->scale1 = param->scale1; |
| wf_smu_sys_fans->offset1 = param->offset1; |
| |
| /* Fill PID params */ |
| pid_param.gd = param->gd; |
| pid_param.gp = param->gp; |
| pid_param.gr = param->gr; |
| pid_param.interval = WF_SMU_SYS_FANS_INTERVAL; |
| pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE; |
| pid_param.itarget = param->itarget; |
| pid_param.min = fan_system->ops->get_min(fan_system); |
| pid_param.max = fan_system->ops->get_max(fan_system); |
| if (fan_hd) { |
| pid_param.min = |
| max(pid_param.min,fan_hd->ops->get_min(fan_hd)); |
| pid_param.max = |
| min(pid_param.max,fan_hd->ops->get_max(fan_hd)); |
| } |
| wf_pid_init(&wf_smu_sys_fans->pid, &pid_param); |
| |
| DBG("wf: System Fan control initialized.\n"); |
| DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", |
| FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max); |
| return; |
| |
| fail: |
| |
| if (fan_system) |
| wf_control_set_max(fan_system); |
| if (fan_hd) |
| wf_control_set_max(fan_hd); |
| } |
| |
| static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st) |
| { |
| s32 new_setpoint, temp, scaled, cputarget; |
| int rc; |
| |
| if (--st->ticks != 0) { |
| if (wf_smu_readjust) |
| goto readjust; |
| return; |
| } |
| st->ticks = WF_SMU_SYS_FANS_INTERVAL; |
| |
| rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp); |
| if (rc) { |
| printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", |
| rc); |
| wf_smu_failure_state |= FAILURE_SENSOR; |
| return; |
| } |
| |
| DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n", |
| FIX32TOPRINT(temp)); |
| |
| if (temp > (st->pid.param.itarget + 0x50000)) |
| wf_smu_failure_state |= FAILURE_OVERTEMP; |
| |
| new_setpoint = wf_pid_run(&st->pid, temp); |
| |
| DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); |
| |
| scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0; |
| |
| DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled); |
| |
| cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0; |
| cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1; |
| scaled = max(scaled, cputarget); |
| scaled = max(scaled, st->pid.param.min); |
| scaled = min(scaled, st->pid.param.max); |
| |
| DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled); |
| |
| if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint) |
| return; |
| st->sys_setpoint = scaled; |
| st->hd_setpoint = new_setpoint; |
| readjust: |
| if (fan_system && wf_smu_failure_state == 0) { |
| rc = fan_system->ops->set_value(fan_system, st->sys_setpoint); |
| if (rc) { |
| printk(KERN_WARNING "windfarm: Sys fan error %d\n", |
| rc); |
| wf_smu_failure_state |= FAILURE_FAN; |
| } |
| } |
| if (fan_hd && wf_smu_failure_state == 0) { |
| rc = fan_hd->ops->set_value(fan_hd, st->hd_setpoint); |
| if (rc) { |
| printk(KERN_WARNING "windfarm: HD fan error %d\n", |
| rc); |
| wf_smu_failure_state |= FAILURE_FAN; |
| } |
| } |
| } |
| |
| static void wf_smu_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; |
| s32 tmax, tdelta, maxpow, powadj; |
| |
| /* First, locate the PID params in SMU SBD */ |
| hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); |
| if (hdr == 0) { |
| printk(KERN_WARNING "windfarm: CPU PID fan config not found " |
| "max fan speed\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 */ |
| wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), |
| GFP_KERNEL); |
| if (wf_smu_cpu_fans == NULL) |
| goto fail; |
| wf_smu_cpu_fans->ticks = 1; |
| |
| wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE; |
| wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET; |
| |
| /* Fill PID params */ |
| pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; |
| pid_param.history_len = piddata->history_len; |
| if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { |
| printk(KERN_WARNING "windfarm: 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_main->ops->get_min(fan_cpu_main); |
| pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main); |
| |
| wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); |
| |
| DBG("wf: CPU Fan control initialized.\n"); |
| DBG(" 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 "windfarm: CPU fan config not found\n" |
| "for this machine model, max fan speed\n"); |
| |
| if (cpufreq_clamp) |
| wf_control_set_max(cpufreq_clamp); |
| if (fan_cpu_main) |
| wf_control_set_max(fan_cpu_main); |
| } |
| |
| static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) |
| { |
| s32 new_setpoint, temp, power, systarget; |
| int rc; |
| |
| if (--st->ticks != 0) { |
| if (wf_smu_readjust) |
| goto readjust; |
| return; |
| } |
| st->ticks = WF_SMU_CPU_FANS_INTERVAL; |
| |
| rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); |
| if (rc) { |
| printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", |
| rc); |
| wf_smu_failure_state |= FAILURE_SENSOR; |
| return; |
| } |
| |
| rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); |
| if (rc) { |
| printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", |
| rc); |
| wf_smu_failure_state |= FAILURE_SENSOR; |
| return; |
| } |
| |
| DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", |
| FIX32TOPRINT(temp), FIX32TOPRINT(power)); |
| |
| #ifdef HACKED_OVERTEMP |
| if (temp > 0x4a0000) |
| wf_smu_failure_state |= FAILURE_OVERTEMP; |
| #else |
| if (temp > st->pid.param.tmax) |
| wf_smu_failure_state |= FAILURE_OVERTEMP; |
| #endif |
| new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); |
| |
| DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); |
| |
| systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0; |
| systarget = ((((s64)systarget) * (s64)st->scale) >> 12) |
| + st->offset; |
| new_setpoint = max(new_setpoint, systarget); |
| new_setpoint = max(new_setpoint, st->pid.param.min); |
| new_setpoint = min(new_setpoint, st->pid.param.max); |
| |
| DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint); |
| |
| if (st->cpu_setpoint == new_setpoint) |
| return; |
| st->cpu_setpoint = new_setpoint; |
| readjust: |
| if (fan_cpu_main && wf_smu_failure_state == 0) { |
| rc = fan_cpu_main->ops->set_value(fan_cpu_main, |
| st->cpu_setpoint); |
| if (rc) { |
| printk(KERN_WARNING "windfarm: CPU main fan" |
| " error %d\n", rc); |
| wf_smu_failure_state |= FAILURE_FAN; |
| } |
| } |
| } |
| |
| /* |
| * ****** Setup / Init / Misc ... ****** |
| * |
| */ |
| |
| static void wf_smu_tick(void) |
| { |
| unsigned int last_failure = wf_smu_failure_state; |
| unsigned int new_failure; |
| |
| if (!wf_smu_started) { |
| DBG("wf: creating control loops !\n"); |
| wf_smu_create_sys_fans(); |
| wf_smu_create_cpu_fans(); |
| wf_smu_started = 1; |
| } |
| |
| /* Skipping ticks */ |
| if (wf_smu_skipping && --wf_smu_skipping) |
| return; |
| |
| wf_smu_failure_state = 0; |
| if (wf_smu_sys_fans) |
| wf_smu_sys_fans_tick(wf_smu_sys_fans); |
| if (wf_smu_cpu_fans) |
| wf_smu_cpu_fans_tick(wf_smu_cpu_fans); |
| |
| wf_smu_readjust = 0; |
| new_failure = wf_smu_failure_state & ~last_failure; |
| |
| /* If entering failure mode, clamp cpufreq and ramp all |
| * fans to full speed. |
| */ |
| if (wf_smu_failure_state && !last_failure) { |
| if (cpufreq_clamp) |
| wf_control_set_max(cpufreq_clamp); |
| if (fan_system) |
| wf_control_set_max(fan_system); |
| if (fan_cpu_main) |
| wf_control_set_max(fan_cpu_main); |
| if (fan_hd) |
| wf_control_set_max(fan_hd); |
| } |
| |
| /* If leaving failure mode, unclamp cpufreq and readjust |
| * all fans on next iteration |
| */ |
| if (!wf_smu_failure_state && last_failure) { |
| if (cpufreq_clamp) |
| wf_control_set_min(cpufreq_clamp); |
| wf_smu_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(); |
| wf_smu_skipping = 2; |
| } |
| |
| /* 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 (new_failure == 0 && last_failure & FAILURE_OVERTEMP) |
| wf_clear_overtemp(); |
| } |
| |
| static void wf_smu_new_control(struct wf_control *ct) |
| { |
| if (wf_smu_all_controls_ok) |
| return; |
| |
| if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) { |
| if (wf_get_control(ct) == 0) |
| fan_cpu_main = ct; |
| } |
| |
| if (fan_system == NULL && !strcmp(ct->name, "system-fan")) { |
| if (wf_get_control(ct) == 0) |
| fan_system = ct; |
| } |
| |
| if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { |
| if (wf_get_control(ct) == 0) |
| cpufreq_clamp = ct; |
| } |
| |
| /* Darwin property list says the HD fan is only for model ID |
| * 0, 1, 2 and 3 |
| */ |
| |
| if (wf_smu_mach_model > 3) { |
| if (fan_system && fan_cpu_main && cpufreq_clamp) |
| wf_smu_all_controls_ok = 1; |
| return; |
| } |
| |
| if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { |
| if (wf_get_control(ct) == 0) |
| fan_hd = ct; |
| } |
| |
| if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp) |
| wf_smu_all_controls_ok = 1; |
| } |
| |
| static void wf_smu_new_sensor(struct wf_sensor *sr) |
| { |
| if (wf_smu_all_sensors_ok) |
| return; |
| |
| if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { |
| if (wf_get_sensor(sr) == 0) |
| sensor_cpu_power = sr; |
| } |
| |
| if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { |
| if (wf_get_sensor(sr) == 0) |
| sensor_cpu_temp = sr; |
| } |
| |
| if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { |
| if (wf_get_sensor(sr) == 0) |
| sensor_hd_temp = sr; |
| } |
| |
| if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp) |
| wf_smu_all_sensors_ok = 1; |
| } |
| |
| |
| static int wf_smu_notify(struct notifier_block *self, |
| unsigned long event, void *data) |
| { |
| switch(event) { |
| case WF_EVENT_NEW_CONTROL: |
| DBG("wf: new control %s detected\n", |
| ((struct wf_control *)data)->name); |
| wf_smu_new_control(data); |
| wf_smu_readjust = 1; |
| break; |
| case WF_EVENT_NEW_SENSOR: |
| DBG("wf: new sensor %s detected\n", |
| ((struct wf_sensor *)data)->name); |
| wf_smu_new_sensor(data); |
| break; |
| case WF_EVENT_TICK: |
| if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) |
| wf_smu_tick(); |
| } |
| |
| return 0; |
| } |
| |
| static struct notifier_block wf_smu_events = { |
| .notifier_call = wf_smu_notify, |
| }; |
| |
| static int wf_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]; |
| wf_smu_mach_model = st->model_id; |
| } |
| |
| printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n", |
| wf_smu_mach_model); |
| |
| return 0; |
| } |
| |
| static int wf_smu_probe(struct platform_device *ddev) |
| { |
| wf_register_client(&wf_smu_events); |
| |
| return 0; |
| } |
| |
| static int __devexit wf_smu_remove(struct platform_device *ddev) |
| { |
| wf_unregister_client(&wf_smu_events); |
| |
| /* XXX We don't have yet a guarantee that our callback isn't |
| * in progress when returning from wf_unregister_client, so |
| * we add an arbitrary delay. I'll have to fix that in the core |
| */ |
| msleep(1000); |
| |
| /* Release all sensors */ |
| /* One more crappy race: I don't think we have any guarantee here |
| * that the attribute callback won't race with the sensor beeing |
| * disposed of, and I'm not 100% certain what best way to deal |
| * with that except by adding locks all over... I'll do that |
| * eventually but heh, who ever rmmod this module anyway ? |
| */ |
| if (sensor_cpu_power) |
| wf_put_sensor(sensor_cpu_power); |
| if (sensor_cpu_temp) |
| wf_put_sensor(sensor_cpu_temp); |
| if (sensor_hd_temp) |
| wf_put_sensor(sensor_hd_temp); |
| |
| /* Release all controls */ |
| if (fan_cpu_main) |
| wf_put_control(fan_cpu_main); |
| if (fan_hd) |
| wf_put_control(fan_hd); |
| if (fan_system) |
| wf_put_control(fan_system); |
| if (cpufreq_clamp) |
| wf_put_control(cpufreq_clamp); |
| |
| /* Destroy control loops state structures */ |
| if (wf_smu_sys_fans) |
| kfree(wf_smu_sys_fans); |
| if (wf_smu_cpu_fans) |
| kfree(wf_smu_cpu_fans); |
| |
| return 0; |
| } |
| |
| static struct platform_driver wf_smu_driver = { |
| .probe = wf_smu_probe, |
| .remove = __devexit_p(wf_smu_remove), |
| .driver = { |
| .name = "windfarm", |
| .bus = &platform_bus_type, |
| }, |
| }; |
| |
| |
| static int __init wf_smu_init(void) |
| { |
| int rc = -ENODEV; |
| |
| if (machine_is_compatible("PowerMac8,1") || |
| machine_is_compatible("PowerMac8,2")) |
| rc = wf_init_pm(); |
| |
| if (rc == 0) { |
| #ifdef MODULE |
| request_module("windfarm_smu_controls"); |
| request_module("windfarm_smu_sensors"); |
| request_module("windfarm_lm75_sensor"); |
| |
| #endif /* MODULE */ |
| platform_driver_register(&wf_smu_driver); |
| } |
| |
| return rc; |
| } |
| |
| static void __exit wf_smu_exit(void) |
| { |
| |
| platform_driver_unregister(&wf_smu_driver); |
| } |
| |
| |
| module_init(wf_smu_init); |
| module_exit(wf_smu_exit); |
| |
| MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); |
| MODULE_DESCRIPTION("Thermal control logic for iMac G5"); |
| MODULE_LICENSE("GPL"); |
| |