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sysfs-led-white.c
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sysfs-led-white.c
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/** @file sysfs-led-white.c
*
* mce-plugin-libhybris - Libhybris plugin for Mode Control Entity
* <p>
* Copyright (C) 2017 Jolla Ltd.
* <p>
* @author Simo Piiroinen <simo.piiroinen@jollamobile.com>
*
* mce-plugin-libhybris is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License.
*
* mce-plugin-libhybris 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with mce-plugin-libhybris; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* ========================================================================= *
* White / single color led control
*
* One channel, which:
* - must have 'brightness' control file
* - must have 'max_brightness' control file
* ========================================================================= */
#include "sysfs-led-white.h"
#include "sysfs-led-util.h"
#include "sysfs-val.h"
#include "plugin-config.h"
#include <stdio.h>
#include <string.h>
#include <glib.h>
/* ========================================================================= *
* PROTOTYPES
* ========================================================================= */
typedef struct
{
const char *max_brightness; // R
const char *brightness; // W
} led_paths_white_t;
typedef struct
{
sysfsval_t *cached_max_brightness;
sysfsval_t *cached_brightness;
} led_channel_white_t;
/* ------------------------------------------------------------------------- *
* ONE_CHANNEL
* ------------------------------------------------------------------------- */
static void led_channel_white_init (led_channel_white_t *self);
static void led_channel_white_close (led_channel_white_t *self);
static bool led_channel_white_probe (led_channel_white_t *self, const led_paths_white_t *path);
static void led_channel_white_set_value (const led_channel_white_t *self, int value);
/* ------------------------------------------------------------------------- *
* ALL_CHANNELS
* ------------------------------------------------------------------------- */
static void led_control_white_map_color (int r, int g, int b, int *white);
static void led_control_white_value_cb (void *data, int r, int g, int b);
static void led_control_white_close_cb (void *data);
bool led_control_white_probe (led_control_t *self);
/* ========================================================================= *
* ONE_CHANNEL
* ========================================================================= */
static void
led_channel_white_init(led_channel_white_t *self)
{
self->cached_max_brightness = sysfsval_create();
self->cached_brightness = sysfsval_create();
}
static void
led_channel_white_close(led_channel_white_t *self)
{
sysfsval_delete(self->cached_max_brightness),
self->cached_max_brightness = 0;
sysfsval_delete(self->cached_brightness),
self->cached_brightness = 0;
}
static bool
led_channel_white_probe(led_channel_white_t *self,
const led_paths_white_t *path)
{
bool res = false;
if( !sysfsval_open_rw(self->cached_brightness, path->brightness) )
goto cleanup;
if( !sysfsval_open_ro(self->cached_max_brightness, path->max_brightness) )
goto cleanup;
sysfsval_refresh(self->cached_max_brightness);
if( sysfsval_get(self->cached_max_brightness) <= 0 )
goto cleanup;
res = true;
cleanup:
/* Always close the max_brightness file */
sysfsval_close(self->cached_max_brightness);
/* On failure close the other files too */
if( !res )
{
sysfsval_close(self->cached_brightness);
}
return res;
}
static void
led_channel_white_set_value(const led_channel_white_t *self, int value)
{
value = led_util_scale_value(value,
sysfsval_get(self->cached_max_brightness));
sysfsval_set(self->cached_brightness, value);
}
/* ========================================================================= *
* ALL_CHANNELS
* ========================================================================= */
#define WHITE_CHANNELS 1
static void
led_control_white_map_color(int r, int g, int b, int *white)
{
/* Use maximum value from requested RGB value */
if( r < g ) r = g;
if( r < b ) r = b;
*white = r;
}
static void
led_control_white_value_cb(void *data, int r, int g, int b)
{
const led_channel_white_t *channel = data;
int white = 0;
led_control_white_map_color(r, g, b, &white);
led_channel_white_set_value(channel + 0, white);
}
static void
led_control_white_close_cb(void *data)
{
led_channel_white_t *channel = data;
led_channel_white_close(channel + 0);
}
static bool
led_control_white_static_probe(led_channel_white_t *channel)
{
/** Sysfs control paths for White leds */
static const led_paths_white_t paths[][WHITE_CHANNELS] =
{
// "Motorola Moto G (2nd gen)"
{
{
.max_brightness = "/sys/class/leds/white/max_brightness",
.brightness = "/sys/class/leds/white/brightness",
},
},
};
bool ack = false;
for( size_t i = 0; i < G_N_ELEMENTS(paths); ++i ) {
if( (ack = led_channel_white_probe(channel+0, &paths[i][0])) )
break;
}
return ack;
}
static bool
led_control_white_dynamic_probe(led_channel_white_t *channel)
{
static const objconf_t white_conf[] =
{
OBJCONF_FILE(led_paths_white_t, brightness, Brightness),
OBJCONF_FILE(led_paths_white_t, max_brightness, MaxBrightness),
OBJCONF_STOP
};
static const char * const pfix[WHITE_CHANNELS] =
{
"Led",
};
bool ack = false;
led_paths_white_t paths[WHITE_CHANNELS];
memset(paths, 0, sizeof paths);
for( size_t i = 0; i < WHITE_CHANNELS; ++i )
objconf_init(white_conf, &paths[i]);
for( size_t i = 0; i < WHITE_CHANNELS; ++i ) {
if( !objconf_parse(white_conf, &paths[i], pfix[i]) )
goto cleanup;
if( !led_channel_white_probe(channel+i, &paths[i]) )
goto cleanup;
}
ack = true;
cleanup:
for( size_t i = 0; i < WHITE_CHANNELS; ++i )
objconf_quit(white_conf, &paths[i]);
return ack;
}
bool
led_control_white_probe(led_control_t *self)
{
static led_channel_white_t channel[WHITE_CHANNELS];
bool res = false;
led_channel_white_init(channel + 0);
self->name = "white";
self->data = channel;
self->enable = 0;
self->value = led_control_white_value_cb;
self->close = led_control_white_close_cb;
/* We can use sw breathing logic */
self->can_breathe = true;
if( self->use_config )
res = led_control_white_dynamic_probe(channel);
if( !res )
res = led_control_white_static_probe(channel);
if( !res )
led_control_close(self);
return res;
}