nouveau_pm.c

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/*
 * Copyright 2010 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#ifdef CONFIG_ACPI
#include <linux/acpi.h>
#endif
#include <linux/power_supply.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>

#include <drm/drmP.h>

#include "nouveau_drm.h"
#include "nouveau_pm.h"

#include <subdev/gpio.h>
#include <subdev/timer.h>
#include <subdev/therm.h>

MODULE_PARM_DESC(perflvl, "Performance level (default: boot)");
static char *nouveau_perflvl;
module_param_named(perflvl, nouveau_perflvl, charp, 0400);

MODULE_PARM_DESC(perflvl_wr, "Allow perflvl changes (warning: dangerous!)");
static int nouveau_perflvl_wr;
module_param_named(perflvl_wr, nouveau_perflvl_wr, int, 0400);

static int
nouveau_pm_perflvl_aux(struct drm_device *dev, struct nouveau_pm_level *perflvl,
               struct nouveau_pm_level *a, struct nouveau_pm_level *b)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    int ret;

    /*XXX: not on all boards, we should control based on temperature
     *     on recent boards..  or maybe on some other factor we don't
     *     know about?
     */
    if (therm && therm->fan_set &&
        a->fanspeed && b->fanspeed && b->fanspeed > a->fanspeed) {
        ret = therm->fan_set(therm, perflvl->fanspeed);
        if (ret && ret != -ENODEV) {
            NV_ERROR(drm, "fanspeed set failed: %d\n", ret);
        }
    }

    if (pm->voltage.supported && pm->voltage_set) {
        if (perflvl->volt_min && b->volt_min > a->volt_min) {
            ret = pm->voltage_set(dev, perflvl->volt_min);
            if (ret) {
                NV_ERROR(drm, "voltage set failed: %d\n", ret);
                return ret;
            }
        }
    }

    return 0;
}

static int
nouveau_pm_perflvl_set(struct drm_device *dev, struct nouveau_pm_level *perflvl)
{
    struct nouveau_pm *pm = nouveau_pm(dev);
    void *state;
    int ret;

    if (perflvl == pm->cur)
        return 0;

    ret = nouveau_pm_perflvl_aux(dev, perflvl, pm->cur, perflvl);
    if (ret)
        return ret;

    state = pm->clocks_pre(dev, perflvl);
    if (IS_ERR(state)) {
        ret = PTR_ERR(state);
        goto error;
    }
    ret = pm->clocks_set(dev, state);
    if (ret)
        goto error;

    ret = nouveau_pm_perflvl_aux(dev, perflvl, perflvl, pm->cur);
    if (ret)
        return ret;

    pm->cur = perflvl;
    return 0;

error:
    /* restore the fan speed and voltage before leaving */
    nouveau_pm_perflvl_aux(dev, perflvl, perflvl, pm->cur);
    return ret;
}

void
nouveau_pm_trigger(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_timer *ptimer = nouveau_timer(drm->device);
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct nouveau_pm_profile *profile = NULL;
    struct nouveau_pm_level *perflvl = NULL;
    int ret;

    /* select power profile based on current power source */
    if (power_supply_is_system_supplied())
        profile = pm->profile_ac;
    else
        profile = pm->profile_dc;

    if (profile != pm->profile) {
        pm->profile->func->fini(pm->profile);
        pm->profile = profile;
        pm->profile->func->init(pm->profile);
    }

    /* select performance level based on profile */
    perflvl = profile->func->select(profile);

    /* change perflvl, if necessary */
    if (perflvl != pm->cur) {
        u64 time0 = ptimer->read(ptimer);

        NV_INFO(drm, "setting performance level: %d", perflvl->id);
        ret = nouveau_pm_perflvl_set(dev, perflvl);
        if (ret)
            NV_INFO(drm, "> reclocking failed: %d\n\n", ret);

        NV_INFO(drm, "> reclocking took %lluns\n\n",
                 ptimer->read(ptimer) - time0);
    }
}

static struct nouveau_pm_profile *
profile_find(struct drm_device *dev, const char *string)
{
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct nouveau_pm_profile *profile;

    list_for_each_entry(profile, &pm->profiles, head) {
        if (!strncmp(profile->name, string, sizeof(profile->name)))
            return profile;
    }

    return NULL;
}

static int
nouveau_pm_profile_set(struct drm_device *dev, const char *profile)
{
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct nouveau_pm_profile *ac = NULL, *dc = NULL;
    char string[16], *cur = string, *ptr;

    /* safety precaution, for now */
    if (nouveau_perflvl_wr != 7777)
        return -EPERM;

    strncpy(string, profile, sizeof(string));
    string[sizeof(string) - 1] = 0;
    if ((ptr = strchr(string, '\n')))
        *ptr = '\0';

    ptr = strsep(&cur, ",");
    if (ptr)
        ac = profile_find(dev, ptr);

    ptr = strsep(&cur, ",");
    if (ptr)
        dc = profile_find(dev, ptr);
    else
        dc = ac;

    if (ac == NULL || dc == NULL)
        return -EINVAL;

    pm->profile_ac = ac;
    pm->profile_dc = dc;
    nouveau_pm_trigger(dev);
    return 0;
}

static void
nouveau_pm_static_dummy(struct nouveau_pm_profile *profile)
{
}

static struct nouveau_pm_level *
nouveau_pm_static_select(struct nouveau_pm_profile *profile)
{
    return container_of(profile, struct nouveau_pm_level, profile);
}

const struct nouveau_pm_profile_func nouveau_pm_static_profile_func = {
    .destroy = nouveau_pm_static_dummy,
    .init = nouveau_pm_static_dummy,
    .fini = nouveau_pm_static_dummy,
    .select = nouveau_pm_static_select,
};

static int
nouveau_pm_perflvl_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    int ret;

    memset(perflvl, 0, sizeof(*perflvl));

    if (pm->clocks_get) {
        ret = pm->clocks_get(dev, perflvl);
        if (ret)
            return ret;
    }

    if (pm->voltage.supported && pm->voltage_get) {
        ret = pm->voltage_get(dev);
        if (ret > 0) {
            perflvl->volt_min = ret;
            perflvl->volt_max = ret;
        }
    }

    if (therm && therm->fan_get) {
        ret = therm->fan_get(therm);
        if (ret >= 0)
            perflvl->fanspeed = ret;
    }

    nouveau_mem_timing_read(dev, &perflvl->timing);
    return 0;
}

static void
nouveau_pm_perflvl_info(struct nouveau_pm_level *perflvl, char *ptr, int len)
{
    char c[16], s[16], v[32], f[16], m[16];

    c[0] = '\0';
    if (perflvl->core)
        snprintf(c, sizeof(c), " core %dMHz", perflvl->core / 1000);

    s[0] = '\0';
    if (perflvl->shader)
        snprintf(s, sizeof(s), " shader %dMHz", perflvl->shader / 1000);

    m[0] = '\0';
    if (perflvl->memory)
        snprintf(m, sizeof(m), " memory %dMHz", perflvl->memory / 1000);

    v[0] = '\0';
    if (perflvl->volt_min && perflvl->volt_min != perflvl->volt_max) {
        snprintf(v, sizeof(v), " voltage %dmV-%dmV",
             perflvl->volt_min / 1000, perflvl->volt_max / 1000);
    } else
    if (perflvl->volt_min) {
        snprintf(v, sizeof(v), " voltage %dmV",
             perflvl->volt_min / 1000);
    }

    f[0] = '\0';
    if (perflvl->fanspeed)
        snprintf(f, sizeof(f), " fanspeed %d%%", perflvl->fanspeed);

    snprintf(ptr, len, "%s%s%s%s%s\n", c, s, m, v, f);
}

static ssize_t
nouveau_pm_get_perflvl_info(struct device *d,
                struct device_attribute *a, char *buf)
{
    struct nouveau_pm_level *perflvl =
        container_of(a, struct nouveau_pm_level, dev_attr);
    char *ptr = buf;
    int len = PAGE_SIZE;

    snprintf(ptr, len, "%d:", perflvl->id);
    ptr += strlen(buf);
    len -= strlen(buf);

    nouveau_pm_perflvl_info(perflvl, ptr, len);
    return strlen(buf);
}

static ssize_t
nouveau_pm_get_perflvl(struct device *d, struct device_attribute *a, char *buf)
{
    struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct nouveau_pm_level cur;
    int len = PAGE_SIZE, ret;
    char *ptr = buf;

    snprintf(ptr, len, "profile: %s, %s\nc:",
         pm->profile_ac->name, pm->profile_dc->name);
    ptr += strlen(buf);
    len -= strlen(buf);

    ret = nouveau_pm_perflvl_get(dev, &cur);
    if (ret == 0)
        nouveau_pm_perflvl_info(&cur, ptr, len);
    return strlen(buf);
}

static ssize_t
nouveau_pm_set_perflvl(struct device *d, struct device_attribute *a,
               const char *buf, size_t count)
{
    struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
    int ret;

    ret = nouveau_pm_profile_set(dev, buf);
    if (ret)
        return ret;
    return strlen(buf);
}

static DEVICE_ATTR(performance_level, S_IRUGO | S_IWUSR,
           nouveau_pm_get_perflvl, nouveau_pm_set_perflvl);

static int
nouveau_sysfs_init(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct device *d = &dev->pdev->dev;
    int ret, i;

    ret = device_create_file(d, &dev_attr_performance_level);
    if (ret)
        return ret;

    for (i = 0; i < pm->nr_perflvl; i++) {
        struct nouveau_pm_level *perflvl = &pm->perflvl[i];

        perflvl->dev_attr.attr.name = perflvl->name;
        perflvl->dev_attr.attr.mode = S_IRUGO;
        perflvl->dev_attr.show = nouveau_pm_get_perflvl_info;
        perflvl->dev_attr.store = NULL;
        sysfs_attr_init(&perflvl->dev_attr.attr);

        ret = device_create_file(d, &perflvl->dev_attr);
        if (ret) {
            NV_ERROR(drm, "failed pervlvl %d sysfs: %d\n",
                 perflvl->id, i);
            perflvl->dev_attr.attr.name = NULL;
            nouveau_pm_fini(dev);
            return ret;
        }
    }

    return 0;
}

static void
nouveau_sysfs_fini(struct drm_device *dev)
{
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct device *d = &dev->pdev->dev;
    int i;

    device_remove_file(d, &dev_attr_performance_level);
    for (i = 0; i < pm->nr_perflvl; i++) {
        struct nouveau_pm_level *pl = &pm->perflvl[i];

        if (!pl->dev_attr.attr.name)
            break;

        device_remove_file(d, &pl->dev_attr);
    }
}

#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
static ssize_t
nouveau_hwmon_show_temp(struct device *d, struct device_attribute *a, char *buf)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);

    return snprintf(buf, PAGE_SIZE, "%d\n", therm->temp_get(therm) * 1000);
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, nouveau_hwmon_show_temp,
                          NULL, 0);

static ssize_t
nouveau_hwmon_max_temp(struct device *d, struct device_attribute *a, char *buf)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);

    return snprintf(buf, PAGE_SIZE, "%d\n",
           therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_DOWN_CLK) * 1000);
}
static ssize_t
nouveau_hwmon_set_max_temp(struct device *d, struct device_attribute *a,
                        const char *buf, size_t count)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    long value;

    if (kstrtol(buf, 10, &value) == -EINVAL)
        return count;

    therm->attr_set(therm, NOUVEAU_THERM_ATTR_THRS_DOWN_CLK, value / 1000);

    return count;
}
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, nouveau_hwmon_max_temp,
                          nouveau_hwmon_set_max_temp,
                          0);

static ssize_t
nouveau_hwmon_critical_temp(struct device *d, struct device_attribute *a,
                            char *buf)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);

    return snprintf(buf, PAGE_SIZE, "%d\n",
           therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_CRITICAL) * 1000);
}
static ssize_t
nouveau_hwmon_set_critical_temp(struct device *d, struct device_attribute *a,
                                const char *buf,
                                size_t count)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    long value;

    if (kstrtol(buf, 10, &value) == -EINVAL)
        return count;

    therm->attr_set(therm, NOUVEAU_THERM_ATTR_THRS_CRITICAL, value / 1000);

    return count;
}
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
                        nouveau_hwmon_critical_temp,
                        nouveau_hwmon_set_critical_temp,
                        0);

static ssize_t nouveau_hwmon_show_name(struct device *dev,
                      struct device_attribute *attr,
                      char *buf)
{
    return sprintf(buf, "nouveau\n");
}
static SENSOR_DEVICE_ATTR(name, S_IRUGO, nouveau_hwmon_show_name, NULL, 0);

static ssize_t nouveau_hwmon_show_update_rate(struct device *dev,
                      struct device_attribute *attr,
                      char *buf)
{
    return sprintf(buf, "1000\n");
}
static SENSOR_DEVICE_ATTR(update_rate, S_IRUGO,
                        nouveau_hwmon_show_update_rate,
                        NULL, 0);

static ssize_t
nouveau_hwmon_show_fan0_input(struct device *d, struct device_attribute *attr,
                  char *buf)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);

    return snprintf(buf, PAGE_SIZE, "%d\n", therm->fan_sense(therm));
}
static SENSOR_DEVICE_ATTR(fan0_input, S_IRUGO, nouveau_hwmon_show_fan0_input,
              NULL, 0);

 static ssize_t
nouveau_hwmon_get_pwm1_enable(struct device *d,
               struct device_attribute *a, char *buf)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    int ret;

    ret = therm->attr_get(therm, NOUVEAU_THERM_ATTR_FAN_MODE);
    if (ret < 0)
        return ret;

    return sprintf(buf, "%i\n", ret);
}

static ssize_t
nouveau_hwmon_set_pwm1_enable(struct device *d, struct device_attribute *a,
               const char *buf, size_t count)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    long value;
    int ret;

    if (strict_strtol(buf, 10, &value) == -EINVAL)
        return -EINVAL;

    ret = therm->attr_set(therm, NOUVEAU_THERM_ATTR_FAN_MODE, value);
    if (ret)
        return ret;
    else
        return count;
}
static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
              nouveau_hwmon_get_pwm1_enable,
              nouveau_hwmon_set_pwm1_enable, 0);

static ssize_t
nouveau_hwmon_get_pwm1(struct device *d, struct device_attribute *a, char *buf)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    int ret;

    ret = therm->fan_get(therm);
    if (ret < 0)
        return ret;

    return sprintf(buf, "%i\n", ret);
}

static ssize_t
nouveau_hwmon_set_pwm1(struct device *d, struct device_attribute *a,
               const char *buf, size_t count)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    int ret = -ENODEV;
    long value;

    if (nouveau_perflvl_wr != 7777)
        return -EPERM;

    if (kstrtol(buf, 10, &value) == -EINVAL)
        return -EINVAL;

    ret = therm->fan_set(therm, value);
    if (ret)
        return ret;

    return count;
}

static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR,
              nouveau_hwmon_get_pwm1,
              nouveau_hwmon_set_pwm1, 0);

static ssize_t
nouveau_hwmon_get_pwm1_min(struct device *d,
               struct device_attribute *a, char *buf)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    int ret;

    ret = therm->attr_get(therm, NOUVEAU_THERM_ATTR_FAN_MIN_DUTY);
    if (ret < 0)
        return ret;

    return sprintf(buf, "%i\n", ret);
}

static ssize_t
nouveau_hwmon_set_pwm1_min(struct device *d, struct device_attribute *a,
               const char *buf, size_t count)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    long value;
    int ret;

    if (kstrtol(buf, 10, &value) == -EINVAL)
        return -EINVAL;

    ret = therm->attr_set(therm, NOUVEAU_THERM_ATTR_FAN_MIN_DUTY, value);
    if (ret < 0)
        return ret;

    return count;
}

static SENSOR_DEVICE_ATTR(pwm1_min, S_IRUGO | S_IWUSR,
              nouveau_hwmon_get_pwm1_min,
              nouveau_hwmon_set_pwm1_min, 0);

static ssize_t
nouveau_hwmon_get_pwm1_max(struct device *d,
               struct device_attribute *a, char *buf)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    int ret;

    ret = therm->attr_get(therm, NOUVEAU_THERM_ATTR_FAN_MAX_DUTY);
    if (ret < 0)
        return ret;

    return sprintf(buf, "%i\n", ret);
}

static ssize_t
nouveau_hwmon_set_pwm1_max(struct device *d, struct device_attribute *a,
               const char *buf, size_t count)
{
    struct drm_device *dev = dev_get_drvdata(d);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);
    long value;
    int ret;

    if (kstrtol(buf, 10, &value) == -EINVAL)
        return -EINVAL;

    ret = therm->attr_set(therm, NOUVEAU_THERM_ATTR_FAN_MAX_DUTY, value);
    if (ret < 0)
        return ret;

    return count;
}

static SENSOR_DEVICE_ATTR(pwm1_max, S_IRUGO | S_IWUSR,
              nouveau_hwmon_get_pwm1_max,
              nouveau_hwmon_set_pwm1_max, 0);

static struct attribute *hwmon_attributes[] = {
    &sensor_dev_attr_temp1_input.dev_attr.attr,
    &sensor_dev_attr_temp1_max.dev_attr.attr,
    &sensor_dev_attr_temp1_crit.dev_attr.attr,
    &sensor_dev_attr_name.dev_attr.attr,
    &sensor_dev_attr_update_rate.dev_attr.attr,
    NULL
};
static struct attribute *hwmon_fan_rpm_attributes[] = {
    &sensor_dev_attr_fan0_input.dev_attr.attr,
    NULL
};
static struct attribute *hwmon_pwm_fan_attributes[] = {
    &sensor_dev_attr_pwm1_enable.dev_attr.attr,
    &sensor_dev_attr_pwm1.dev_attr.attr,
    &sensor_dev_attr_pwm1_min.dev_attr.attr,
    &sensor_dev_attr_pwm1_max.dev_attr.attr,
    NULL
};

static const struct attribute_group hwmon_attrgroup = {
    .attrs = hwmon_attributes,
};
static const struct attribute_group hwmon_fan_rpm_attrgroup = {
    .attrs = hwmon_fan_rpm_attributes,
};
static const struct attribute_group hwmon_pwm_fan_attrgroup = {
    .attrs = hwmon_pwm_fan_attributes,
};
#endif

static int
nouveau_hwmon_init(struct drm_device *dev)
{
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_therm *therm = nouveau_therm(drm->device);

#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
    struct device *hwmon_dev;
    int ret = 0;

    if (!therm || !therm->temp_get || !therm->attr_get || !therm->attr_set)
        return -ENODEV;

    hwmon_dev = hwmon_device_register(&dev->pdev->dev);
    if (IS_ERR(hwmon_dev)) {
        ret = PTR_ERR(hwmon_dev);
        NV_ERROR(drm, "Unable to register hwmon device: %d\n", ret);
        return ret;
    }
    dev_set_drvdata(hwmon_dev, dev);

    /* default sysfs entries */
    ret = sysfs_create_group(&dev->pdev->dev.kobj, &hwmon_attrgroup);
    if (ret) {
        if (ret)
            goto error;
    }

    /* if the card has a pwm fan */
    /*XXX: incorrect, need better detection for this, some boards have
     *     the gpio entries for pwm fan control even when there's no
     *     actual fan connected to it... therm table? */
    if (therm->fan_get && therm->fan_get(therm) >= 0) {
        ret = sysfs_create_group(&dev->pdev->dev.kobj,
                     &hwmon_pwm_fan_attrgroup);
        if (ret)
            goto error;
    }

    /* if the card can read the fan rpm */
    if (therm->fan_sense(therm) >= 0) {
        ret = sysfs_create_group(&dev->pdev->dev.kobj,
                     &hwmon_fan_rpm_attrgroup);
        if (ret)
            goto error;
    }

    pm->hwmon = hwmon_dev;

    return 0;

error:
    NV_ERROR(drm, "Unable to create some hwmon sysfs files: %d\n", ret);
    hwmon_device_unregister(hwmon_dev);
    pm->hwmon = NULL;
    return ret;
#else
    pm->hwmon = NULL;
    return 0;
#endif
}

static void
nouveau_hwmon_fini(struct drm_device *dev)
{
#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
    struct nouveau_pm *pm = nouveau_pm(dev);

    if (pm->hwmon) {
        sysfs_remove_group(&dev->pdev->dev.kobj, &hwmon_attrgroup);
        sysfs_remove_group(&dev->pdev->dev.kobj,
                   &hwmon_pwm_fan_attrgroup);
        sysfs_remove_group(&dev->pdev->dev.kobj,
                   &hwmon_fan_rpm_attrgroup);

        hwmon_device_unregister(pm->hwmon);
    }
#endif
}

#if defined(CONFIG_ACPI) && defined(CONFIG_POWER_SUPPLY)
static int
nouveau_pm_acpi_event(struct notifier_block *nb, unsigned long val, void *data)
{
    struct nouveau_pm *pm = container_of(nb, struct nouveau_pm, acpi_nb);
    struct nouveau_drm *drm = nouveau_drm(pm->dev);
    struct acpi_bus_event *entry = (struct acpi_bus_event *)data;

    if (strcmp(entry->device_class, "ac_adapter") == 0) {
        bool ac = power_supply_is_system_supplied();

        NV_DEBUG(drm, "power supply changed: %s\n", ac ? "AC" : "DC");
        nouveau_pm_trigger(pm->dev);
    }

    return NOTIFY_OK;
}
#endif

int
nouveau_pm_init(struct drm_device *dev)
{
    struct nouveau_device *device = nouveau_dev(dev);
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_pm *pm;
    char info[256];
    int ret, i;

    pm = drm->pm = kzalloc(sizeof(*pm), GFP_KERNEL);
    if (!pm)
        return -ENOMEM;

    pm->dev = dev;

    if (device->card_type < NV_40) {
        pm->clocks_get = nv04_pm_clocks_get;
        pm->clocks_pre = nv04_pm_clocks_pre;
        pm->clocks_set = nv04_pm_clocks_set;
        if (nouveau_gpio(drm->device)) {
            pm->voltage_get = nouveau_voltage_gpio_get;
            pm->voltage_set = nouveau_voltage_gpio_set;
        }
    } else
    if (device->card_type < NV_50) {
        pm->clocks_get = nv40_pm_clocks_get;
        pm->clocks_pre = nv40_pm_clocks_pre;
        pm->clocks_set = nv40_pm_clocks_set;
        pm->voltage_get = nouveau_voltage_gpio_get;
        pm->voltage_set = nouveau_voltage_gpio_set;
    } else
    if (device->card_type < NV_C0) {
        if (device->chipset <  0xa3 ||
            device->chipset == 0xaa ||
            device->chipset == 0xac) {
            pm->clocks_get = nv50_pm_clocks_get;
            pm->clocks_pre = nv50_pm_clocks_pre;
            pm->clocks_set = nv50_pm_clocks_set;
        } else {
            pm->clocks_get = nva3_pm_clocks_get;
            pm->clocks_pre = nva3_pm_clocks_pre;
            pm->clocks_set = nva3_pm_clocks_set;
        }
        pm->voltage_get = nouveau_voltage_gpio_get;
        pm->voltage_set = nouveau_voltage_gpio_set;
    } else
    if (device->card_type < NV_E0) {
        pm->clocks_get = nvc0_pm_clocks_get;
        pm->clocks_pre = nvc0_pm_clocks_pre;
        pm->clocks_set = nvc0_pm_clocks_set;
        pm->voltage_get = nouveau_voltage_gpio_get;
        pm->voltage_set = nouveau_voltage_gpio_set;
    }


    /* parse aux tables from vbios */
    nouveau_volt_init(dev);

    INIT_LIST_HEAD(&pm->profiles);

    /* determine current ("boot") performance level */
    ret = nouveau_pm_perflvl_get(dev, &pm->boot);
    if (ret) {
        NV_ERROR(drm, "failed to determine boot perflvl\n");
        return ret;
    }

    strncpy(pm->boot.name, "boot", 4);
    strncpy(pm->boot.profile.name, "boot", 4);
    pm->boot.profile.func = &nouveau_pm_static_profile_func;

    list_add(&pm->boot.profile.head, &pm->profiles);

    pm->profile_ac = &pm->boot.profile;
    pm->profile_dc = &pm->boot.profile;
    pm->profile = &pm->boot.profile;
    pm->cur = &pm->boot;

    /* add performance levels from vbios */
    nouveau_perf_init(dev);

    /* display available performance levels */
    NV_INFO(drm, "%d available performance level(s)\n", pm->nr_perflvl);
    for (i = 0; i < pm->nr_perflvl; i++) {
        nouveau_pm_perflvl_info(&pm->perflvl[i], info, sizeof(info));
        NV_INFO(drm, "%d:%s", pm->perflvl[i].id, info);
    }

    nouveau_pm_perflvl_info(&pm->boot, info, sizeof(info));
    NV_INFO(drm, "c:%s", info);

    /* switch performance levels now if requested */
    if (nouveau_perflvl != NULL)
        nouveau_pm_profile_set(dev, nouveau_perflvl);

    nouveau_sysfs_init(dev);
    nouveau_hwmon_init(dev);
#if defined(CONFIG_ACPI) && defined(CONFIG_POWER_SUPPLY)
    pm->acpi_nb.notifier_call = nouveau_pm_acpi_event;
    register_acpi_notifier(&pm->acpi_nb);
#endif

    return 0;
}

void
nouveau_pm_fini(struct drm_device *dev)
{
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct nouveau_pm_profile *profile, *tmp;

    list_for_each_entry_safe(profile, tmp, &pm->profiles, head) {
        list_del(&profile->head);
        profile->func->destroy(profile);
    }

    if (pm->cur != &pm->boot)
        nouveau_pm_perflvl_set(dev, &pm->boot);

    nouveau_perf_fini(dev);
    nouveau_volt_fini(dev);

#if defined(CONFIG_ACPI) && defined(CONFIG_POWER_SUPPLY)
    unregister_acpi_notifier(&pm->acpi_nb);
#endif
    nouveau_hwmon_fini(dev);
    nouveau_sysfs_fini(dev);

    nouveau_drm(dev)->pm = NULL;
    kfree(pm);
}

void
nouveau_pm_resume(struct drm_device *dev)
{
    struct nouveau_pm *pm = nouveau_pm(dev);
    struct nouveau_pm_level *perflvl;

    if (!pm->cur || pm->cur == &pm->boot)
        return;

    perflvl = pm->cur;
    pm->cur = &pm->boot;
    nouveau_pm_perflvl_set(dev, perflvl);
}