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ported USB force FastCharge from apq8064 (thanks to @motley-git, @fra…
…nciscofranco, Chad Froebel)
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/* | ||
* Author: Chad Froebel <chadfroebel@gmail.com> | ||
* | ||
* Simple port to Nexus 4 : motley <motley.slate@gmail.com> | ||
* | ||
* This software is licensed under the terms of the GNU General Public | ||
* License version 2, as published by the Free Software Foundation, and | ||
* may be copied, distributed, and modified under those terms. | ||
* | ||
* 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. | ||
* | ||
*/ | ||
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/* | ||
* Possible values for "force_fast_charge" are : | ||
* | ||
* 0 - disabled (default) | ||
* 1 - substitute AC to USB unconditional | ||
*/ | ||
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#include <linux/kobject.h> | ||
#include <linux/sysfs.h> | ||
#include <linux/fastchg.h> | ||
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int force_fast_charge; | ||
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/* sysfs interface for "force_fast_charge" */ | ||
static ssize_t force_fast_charge_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) | ||
{ | ||
return sprintf(buf, "%d\n", force_fast_charge); | ||
} | ||
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static ssize_t force_fast_charge_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) | ||
{ | ||
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int new_force_fast_charge; | ||
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sscanf(buf, "%du", &new_force_fast_charge); | ||
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if (new_force_fast_charge >= FAST_CHARGE_DISABLED && new_force_fast_charge <= FAST_CHARGE_FORCE_AC) { | ||
/* update only if valid value provided */ | ||
force_fast_charge = new_force_fast_charge; | ||
} | ||
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return count; | ||
} | ||
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static struct kobj_attribute force_fast_charge_attribute = | ||
__ATTR(force_fast_charge, 0666, force_fast_charge_show, force_fast_charge_store); | ||
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static struct attribute *force_fast_charge_attrs[] = { | ||
&force_fast_charge_attribute.attr, | ||
NULL, | ||
}; | ||
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static struct attribute_group force_fast_charge_attr_group = { | ||
.attrs = force_fast_charge_attrs, | ||
}; | ||
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/* Initialize fast charge sysfs folder */ | ||
static struct kobject *force_fast_charge_kobj; | ||
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int force_fast_charge_init(void) | ||
{ | ||
int force_fast_charge_retval; | ||
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force_fast_charge = FAST_CHARGE_DISABLED; /* Forced fast charge disabled by default */ | ||
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force_fast_charge_kobj = kobject_create_and_add("fast_charge", kernel_kobj); | ||
if (!force_fast_charge_kobj) { | ||
return -ENOMEM; | ||
} | ||
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force_fast_charge_retval = sysfs_create_group(force_fast_charge_kobj, &force_fast_charge_attr_group); | ||
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if (force_fast_charge_retval) | ||
kobject_put(force_fast_charge_kobj); | ||
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if (force_fast_charge_retval) | ||
kobject_put(force_fast_charge_kobj); | ||
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return (force_fast_charge_retval); | ||
} | ||
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void force_fast_charge_exit(void) | ||
{ | ||
kobject_put(force_fast_charge_kobj); | ||
} | ||
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module_init(force_fast_charge_init); | ||
module_exit(force_fast_charge_exit); | ||
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Original file line number | Diff line number | Diff line change |
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/* | ||
* Author: Chad Froebel <chadfroebel@gmail.com> | ||
* | ||
* This software is licensed under the terms of the GNU General Public | ||
* License version 2, as published by the Free Software Foundation, and | ||
* may be copied, distributed, and modified under those terms. | ||
* | ||
* 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. | ||
* | ||
*/ | ||
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#ifndef _LINUX_FASTCHG_H | ||
#define _LINUX_FASTCHG_H | ||
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extern int force_fast_charge; | ||
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#define FAST_CHARGE_DISABLED 0 /* default */ | ||
#define FAST_CHARGE_FORCE_AC 1 | ||
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#endif |