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#include "buttons.h"
extern ssize_t mts_attr_show_gpio_pin(struct device *dev,
struct device_attribute *attr,
char *buf);
extern struct gpio_pin *gpio_pin_by_attr_name(const char *name);
static button_info_pt *buttons = NULL;
struct gpio_pin *gpio_pin_by_button_name(const char *button_name)
{
button_info_pt *pbutton;
for (pbutton = buttons; *pbutton != NULL; pbutton++) {
if (!strcmp(pbutton[0]->name, button_name)) {
return gpio_pin_by_attr_name(pbutton[0]->label_pin);
}
}
log_error("Button named %s not found", button_name);
return NULL;
}
static button_info_t *button_by_monitor_name(const char *label_monitor)
{
button_info_pt *pbutton;
for (pbutton = buttons; *pbutton != NULL; pbutton++) {
if (!strcmp(pbutton[0]->label_monitor, label_monitor)) {
return pbutton[0];
}
}
log_error("Button with %s monitor label is not found", label_monitor);
return NULL;
}
static button_info_t *button_by_monitor_intervals_name(const char *label_monitor_intervals)
{
button_info_pt *pbutton;
for (pbutton = buttons; *pbutton != NULL; pbutton++) {
if (!strcmp(pbutton[0]->label_monitor_intervals, label_monitor_intervals)) {
return pbutton[0];
}
}
log_error("Button with %s monitor intervals label is not found", label_monitor_intervals);
return NULL;
}
ssize_t mts_attr_show_button_monitor_intervals(struct device *dev, struct device_attribute *attr, char *buf)
{
int ret;
button_info_t *button = button_by_monitor_intervals_name(attr->attr.name);
if (!button) {
return -ENODEV;
}
mutex_lock(&mts_io_mutex);
ret = sprintf(buf, "%d %d\n", button->short_interval / BUTTON_CHECK_PER_SEC, button->long_interval / BUTTON_CHECK_PER_SEC);
mutex_unlock(&mts_io_mutex);
return ret;
}
ssize_t mts_attr_store_button_monitor_intervals(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
int short_int;
int long_int;
button_info_t *button = button_by_monitor_intervals_name(attr->attr.name);
if (sscanf(buf, "%i %i", &short_int, &long_int) != 2) {
return -EINVAL;
}
if (!button) {
return -ENODEV;
}
mutex_lock(&mts_io_mutex);
button->short_interval = short_int * BUTTON_CHECK_PER_SEC;
button->long_interval = long_int * BUTTON_CHECK_PER_SEC;
mutex_unlock(&mts_io_mutex);
return count;
}
ssize_t mts_attr_show_button_monitor(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
button_info_t *button = button_by_monitor_name(attr->attr.name);
if (!button) {
return -ENODEV;
}
mutex_lock(&mts_io_mutex);
ret = sprintf(buf, "%d %d %d %d\n", button->pid, button->short_signal, button->long_signal, button->extra_long_signal);
mutex_unlock(&mts_io_mutex);
return ret;
}
ssize_t mts_attr_store_button_monitor(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
pid_t pid;
int short_signal;
int long_signal;
int extra_long_signal;
int result = sscanf(buf, "%i %i %i %i", &pid, &short_signal, &long_signal, &extra_long_signal);
button_info_t *button = button_by_monitor_name(attr->attr.name);
if (!button) {
return -ENODEV;
}
if (result < 3 || result > 4) {
return -EINVAL;
}
if(result == 3) {
mutex_lock(&mts_io_mutex);
button->pid = pid;
button->short_signal = short_signal;
button->long_signal = long_signal;
mutex_unlock(&mts_io_mutex);
} else {
mutex_lock(&mts_io_mutex);
button->pid = pid;
button->short_signal = short_signal;
button->long_signal = long_signal;
button->extra_long_signal = extra_long_signal;
mutex_unlock(&mts_io_mutex);
}
return count;
}
static void button_worker(struct work_struct *ignored);
static DECLARE_DELAYED_WORK(button_work, button_worker);
static void button_worker(struct work_struct *ignored)
{
struct gpio_pin *pin;
struct pid *vpid;
int button_pressed = 0;
button_info_pt *pbutton;
mutex_lock(&mts_io_mutex);
for (pbutton = buttons; *pbutton != NULL; pbutton++) {
button_pressed = 0;
vpid = NULL;
pin = gpio_pin_by_button_name(pbutton[0]->name);
if (pin) {
button_pressed = !gpio_get_value(pin->pin.gpio);
}
if (pbutton[0]->pid > 0) {
vpid = find_vpid(pbutton[0]->pid);
}
if (vpid) {
if (button_pressed) {
pbutton[0]->pressed_count++;
}
else {
// The button is not pressed
if (pbutton[0]->pressed_count > 0 && pbutton[0]->pressed_count < pbutton[0]->short_interval) {
log_debug("Button %s short signal", pbutton[0]->name);
kill_pid(vpid, pbutton[0]->short_signal, 1);
} else if (pbutton[0]->pressed_count >= pbutton[0]->short_interval && pbutton[0]->pressed_count < pbutton[0]->long_interval) {
log_debug("Button %s long signal", pbutton[0]->name);
kill_pid(vpid, pbutton[0]->long_signal, 1);
}
pbutton[0]->pressed_count = 0;
pbutton[0]->sent_extra_long = false;
}
if (pbutton[0]->pressed_count >= pbutton[0]->long_interval && ! pbutton[0]->sent_extra_long) {
log_debug("Button %s extra long signal", pbutton[0]->name);
kill_pid(vpid, pbutton[0]->extra_long_signal, 1);
pbutton[0]->sent_extra_long = true;
}
} else {
pbutton[0]->pressed_count = 0;
}
}
mutex_unlock(&mts_io_mutex);
schedule_delayed_work(&button_work, BUTTON_INTERVAL);
}
int set_buttons (button_info_pt* platform_buttons) {
if (platform_buttons == NULL) {
log_error("Null pointer error");
return -EINVAL;
}
mutex_lock(&mts_io_mutex);
if (buttons != NULL) {
log_warning("Buttons structure was initialized more then once");
}
buttons = platform_buttons;
mutex_unlock(&mts_io_mutex);
return 0;
}
void init_buttons(void) {
if (buttons == NULL) {
log_error("Button structure hasn't been set. Use default");
set_buttons(default_buttons);
}
button_worker(NULL);
}
void cleanup_buttons(void) {
cancel_delayed_work_sync(&button_work);
}
// Reset button is common for all devices
button_info_t reset_button = {
.name = "Reset Button",
.label_pin = "reset",
.label_monitor = "reset-monitor",
.label_monitor_intervals = "reset-monitor-intervals",
/* Signals */
.short_signal = SIGUSR1,
.long_signal = SIGUSR2,
.short_signal = SIGHUP,
/* Intervals */
.short_interval = BUTTON_HOLD_COUNT,
.long_interval = BUTTON_LONG_HOLD_COUNT,
};
DEVICE_ATTR_MTS(dev_attr_reset_monitor_intervals,
reset_button.label_monitor_intervals,
mts_attr_show_button_monitor_intervals,
mts_attr_store_button_monitor_intervals);
DEVICE_ATTR_MTS(dev_attr_reset_monitor,
reset_button.label_monitor,
mts_attr_show_button_monitor,
mts_attr_store_button_monitor);
DEVICE_ATTR_RO_MTS(dev_attr_reset,
reset_button.label_pin,
mts_attr_show_gpio_pin);
button_info_pt default_buttons[] = {
&reset_button,
NULL,
};
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