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/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <soc/qcom/pm.h>
#define GET_CPU_OF_ATTR(attr) \
(container_of(attr, struct msm_pm_kobj_attribute, ka)->cpu)
struct msm_pm_platform_data {
u8 idle_supported; /* Allow device to enter mode during idle */
u8 suspend_supported; /* Allow device to enter mode during suspend */
u8 suspend_enabled; /* enabled for suspend */
u8 idle_enabled; /* enabled for idle low power */
u32 latency; /* interrupt latency in microseconds when entering
and exiting the low power mode */
u32 residency; /* time threshold in microseconds beyond which
staying in the low power mode saves power */
};
static struct msm_pm_platform_data msm_pm_sleep_modes[] = {
[MSM_PM_MODE(0, MSM_PM_SLEEP_MODE_POWER_COLLAPSE_SUSPEND)] = {
.idle_supported = 0,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 1,
},
[MSM_PM_MODE(0, MSM_PM_SLEEP_MODE_POWER_COLLAPSE)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(0, MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(0, MSM_PM_SLEEP_MODE_RETENTION)] = {
.idle_supported = 1,
.suspend_supported = 0,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(0, MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 1,
.suspend_enabled = 1,
},
[MSM_PM_MODE(1, MSM_PM_SLEEP_MODE_POWER_COLLAPSE)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 1,
},
[MSM_PM_MODE(1, MSM_PM_SLEEP_MODE_POWER_COLLAPSE_SUSPEND)] = {
.idle_supported = 0,
.suspend_supported = 0,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(1, MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(1, MSM_PM_SLEEP_MODE_RETENTION)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(1, MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT)] = {
.idle_supported = 1,
.suspend_supported = 0,
.idle_enabled = 1,
.suspend_enabled = 0,
},
[MSM_PM_MODE(2, MSM_PM_SLEEP_MODE_POWER_COLLAPSE_SUSPEND)] = {
.idle_supported = 0,
.suspend_supported = 0,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(2, MSM_PM_SLEEP_MODE_POWER_COLLAPSE)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 1,
},
[MSM_PM_MODE(2, MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(2, MSM_PM_SLEEP_MODE_RETENTION)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(2, MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT)] = {
.idle_supported = 1,
.suspend_supported = 0,
.idle_enabled = 1,
.suspend_enabled = 0,
},
[MSM_PM_MODE(3, MSM_PM_SLEEP_MODE_POWER_COLLAPSE_SUSPEND)] = {
.idle_supported = 0,
.suspend_supported = 0,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(3, MSM_PM_SLEEP_MODE_POWER_COLLAPSE)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 1,
},
[MSM_PM_MODE(3, MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(3, MSM_PM_SLEEP_MODE_RETENTION)] = {
.idle_supported = 1,
.suspend_supported = 1,
.idle_enabled = 0,
.suspend_enabled = 0,
},
[MSM_PM_MODE(3, MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT)] = {
.idle_supported = 1,
.suspend_supported = 0,
.idle_enabled = 1,
.suspend_enabled = 0,
},
[MSM_PM_MODE(3, MSM_PM_SLEEP_MODE_NR)] = {
.idle_supported = 0,
.suspend_supported = 0,
.idle_enabled = 0,
.suspend_enabled = 0,
},
};
enum {
MSM_PM_MODE_ATTR_SUSPEND,
MSM_PM_MODE_ATTR_IDLE,
MSM_PM_MODE_ATTR_NR,
};
static char *msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_NR] = {
[MSM_PM_MODE_ATTR_SUSPEND] = "suspend_enabled",
[MSM_PM_MODE_ATTR_IDLE] = "idle_enabled",
};
struct msm_pm_kobj_attribute {
unsigned int cpu;
struct kobj_attribute ka;
};
struct msm_pm_sysfs_sleep_mode {
struct kobject *kobj;
struct attribute_group attr_group;
struct attribute *attrs[MSM_PM_MODE_ATTR_NR + 1];
struct msm_pm_kobj_attribute kas[MSM_PM_MODE_ATTR_NR];
};
static char *msm_pm_sleep_mode_labels[MSM_PM_SLEEP_MODE_NR] = {
[MSM_PM_SLEEP_MODE_POWER_COLLAPSE] = "power_collapse",
[MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT] = "wfi",
[MSM_PM_SLEEP_MODE_RETENTION] = "retention",
[MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE] =
"standalone_power_collapse",
};
/*
* Write out the attribute.
*/
static ssize_t msm_pm_mode_attr_show(
struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
int ret = -EINVAL;
int i;
for (i = 0; i < MSM_PM_SLEEP_MODE_NR; i++) {
struct kernel_param kp;
unsigned int cpu;
struct msm_pm_platform_data *mode;
if (msm_pm_sleep_mode_labels[i] == NULL)
continue;
if (strcmp(kobj->name, msm_pm_sleep_mode_labels[i]))
continue;
cpu = GET_CPU_OF_ATTR(attr);
mode = &msm_pm_sleep_modes[MSM_PM_MODE(cpu, i)];
if (!strcmp(attr->attr.name,
msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_SUSPEND])) {
u32 arg = mode->suspend_enabled;
kp.arg = &arg;
ret = param_get_int(buf, &kp);
} else if (!strcmp(attr->attr.name,
msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_IDLE])) {
u32 arg = mode->idle_enabled;
kp.arg = &arg;
ret = param_get_int(buf, &kp);
}
break;
}
if (ret > 0) {
strlcat(buf, "\n", PAGE_SIZE);
ret++;
}
return ret;
}
static ssize_t msm_pm_mode_attr_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
int ret = -EINVAL;
int i;
for (i = 0; i < MSM_PM_SLEEP_MODE_NR; i++) {
struct kernel_param kp;
unsigned int cpu;
struct msm_pm_platform_data *mode;
if (msm_pm_sleep_mode_labels[i] == NULL)
continue;
if (strcmp(kobj->name, msm_pm_sleep_mode_labels[i]))
continue;
cpu = GET_CPU_OF_ATTR(attr);
mode = &msm_pm_sleep_modes[MSM_PM_MODE(cpu, i)];
if (!strcmp(attr->attr.name,
msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_SUSPEND])) {
kp.arg = &mode->suspend_enabled;
ret = param_set_byte(buf, &kp);
} else if (!strcmp(attr->attr.name,
msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_IDLE])) {
kp.arg = &mode->idle_enabled;
ret = param_set_byte(buf, &kp);
}
break;
}
return ret ? ret : count;
}
static int msm_pm_mode_sysfs_add_cpu(
unsigned int cpu, struct kobject *modes_kobj)
{
char cpu_name[8];
struct kobject *cpu_kobj;
struct msm_pm_sysfs_sleep_mode *mode = NULL;
int i, j, k;
int ret;
snprintf(cpu_name, sizeof(cpu_name), "cpu%u", cpu);
cpu_kobj = kobject_create_and_add(cpu_name, modes_kobj);
if (!cpu_kobj) {
pr_err("%s: cannot create %s kobject\n", __func__, cpu_name);
ret = -ENOMEM;
goto mode_sysfs_add_cpu_exit;
}
for (i = 0; i < MSM_PM_SLEEP_MODE_NR; i++) {
int idx = MSM_PM_MODE(cpu, i);
if ((!msm_pm_sleep_modes[idx].suspend_supported)
&& (!msm_pm_sleep_modes[idx].idle_supported))
continue;
if (!msm_pm_sleep_mode_labels[i] ||
!msm_pm_sleep_mode_labels[i][0])
continue;
mode = kzalloc(sizeof(*mode), GFP_KERNEL);
if (!mode) {
pr_err("%s: cannot allocate memory for attributes\n",
__func__);
ret = -ENOMEM;
goto mode_sysfs_add_cpu_exit;
}
mode->kobj = kobject_create_and_add(
msm_pm_sleep_mode_labels[i], cpu_kobj);
if (!mode->kobj) {
pr_err("%s: cannot create kobject\n", __func__);
ret = -ENOMEM;
goto mode_sysfs_add_cpu_exit;
}
for (k = 0, j = 0; k < MSM_PM_MODE_ATTR_NR; k++) {
if ((k == MSM_PM_MODE_ATTR_IDLE) &&
!msm_pm_sleep_modes[idx].idle_supported)
continue;
if ((k == MSM_PM_MODE_ATTR_SUSPEND) &&
!msm_pm_sleep_modes[idx].suspend_supported)
continue;
sysfs_attr_init(&mode->kas[j].ka.attr);
mode->kas[j].cpu = cpu;
mode->kas[j].ka.attr.mode = 0644;
mode->kas[j].ka.show = msm_pm_mode_attr_show;
mode->kas[j].ka.store = msm_pm_mode_attr_store;
mode->kas[j].ka.attr.name = msm_pm_mode_attr_labels[k];
mode->attrs[j] = &mode->kas[j].ka.attr;
j++;
}
mode->attrs[j] = NULL;
mode->attr_group.attrs = mode->attrs;
ret = sysfs_create_group(mode->kobj, &mode->attr_group);
if (ret) {
pr_err("%s: cannot create kobject attribute group\n",
__func__);
goto mode_sysfs_add_cpu_exit;
}
}
ret = 0;
mode_sysfs_add_cpu_exit:
if (ret) {
if (mode && mode->kobj)
kobject_del(mode->kobj);
kfree(mode);
}
return ret;
}
int msm_pm_mode_sysfs_add(const char *pm_modname)
{
struct kobject *module_kobj;
struct kobject *modes_kobj;
unsigned int cpu;
int ret;
module_kobj = kset_find_obj(module_kset, pm_modname);
if (!module_kobj) {
pr_err("%s: cannot find kobject for module %s\n",
__func__, pm_modname);
ret = -ENOENT;
goto mode_sysfs_add_exit;
}
modes_kobj = kobject_create_and_add("modes", module_kobj);
if (!modes_kobj) {
pr_err("%s: cannot create modes kobject\n", __func__);
ret = -ENOMEM;
goto mode_sysfs_add_exit;
}
for_each_possible_cpu(cpu) {
ret = msm_pm_mode_sysfs_add_cpu(cpu, modes_kobj);
if (ret)
goto mode_sysfs_add_exit;
}
ret = 0;
mode_sysfs_add_exit:
return ret;
}
int msm_pm_sleep_mode_supported(unsigned int cpu,
unsigned int mode, bool idle)
{
int idx = MSM_PM_MODE(cpu, mode);
if (idle)
return msm_pm_sleep_modes[idx].idle_supported;
else
return msm_pm_sleep_modes[idx].suspend_supported;
}
EXPORT_SYMBOL(msm_pm_sleep_mode_supported);
int msm_pm_sleep_mode_allow(unsigned int cpu,
unsigned int mode, bool idle)
{
int idx = MSM_PM_MODE(cpu, mode);
if ((mode == MSM_PM_SLEEP_MODE_RETENTION)
&& !msm_pm_retention_enabled())
return false;
if (idle)
return msm_pm_sleep_modes[idx].idle_enabled &&
msm_pm_sleep_modes[idx].idle_supported;
else
return msm_pm_sleep_modes[idx].suspend_enabled &&
msm_pm_sleep_modes[idx].suspend_supported;
}
EXPORT_SYMBOL(msm_pm_sleep_mode_allow);
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