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static int radio_off_telit(void)
{
int value, ret;
struct gpio_pin *pwrmon_pin = gpio_pin_by_name("PWRMON");
struct gpio_pin *onoff_pin = gpio_pin_by_name("3G_ONOFF");
struct gpio_pin *rst_pin = gpio_pin_by_name("3G_RST");
if (!onoff_pin || !pwrmon_pin || !rst_pin) {
return -ENODEV;
}
value = gpio_get_value(pwrmon_pin->pin.gpio);
if(value == 0) {
log_error("radio is already off");
return -EINVAL;
}
// drive on/off pin low for at least 3 sec
log_info("shutting down radio");
ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 0, onoff_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
msleep(3500);
// set on/off pin high
ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 1, onoff_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
// wait for radio to power off
msleep(5000);
// check that power is low
value = gpio_get_value(pwrmon_pin->pin.gpio);
if(value != 0) {
log_warning("radio is still on. performing radio reset.");
//Perform Hard Reset
ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 0, rst_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
msleep(500);
// set pin high
ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 1, rst_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
} else {
log_info("radio has been shut down");
}
return ret;
}
static int radio_on_telit(void)
{
int value, ret;
struct gpio_pin *pwrmon_pin = gpio_pin_by_name("PWRMON");
struct gpio_pin *onoff_pin = gpio_pin_by_name("3G_ONOFF");
struct gpio_pin *rst_pin = gpio_pin_by_name("3G_RST");
if (!onoff_pin || !pwrmon_pin || !rst_pin) {
return -ENODEV;
}
value = gpio_get_value(pwrmon_pin->pin.gpio);
if(value != 0) {
log_error("radio is already on");
return -EINVAL;
}
// drive on/off pin low for at least 5 sec
log_info("turning on radio");
ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 0, onoff_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
msleep(5500);
// set on/off pin high
ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 1, onoff_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
msleep(200);
// check that power is high
value = gpio_get_value(pwrmon_pin->pin.gpio);
if(value == 0) {
log_warning("radio is still off. performing radio reset");
//Perform Hard Reset
ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 0, rst_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
msleep(500);
// set pin high
ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 1, rst_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
} else {
log_info("radio has been turned on");
}
return ret;
}
static ssize_t mts_attr_store_radio_power_telit(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int value;
int err;
if (sscanf(buf, "%i", &value) != 1) {
return -EINVAL;
}
if (value == 0) {
mutex_lock(&mts_io_mutex);
err = radio_off_telit();
mutex_unlock(&mts_io_mutex);
} else {
mutex_lock(&mts_io_mutex);
err = radio_on_telit();
mutex_unlock(&mts_io_mutex);
}
if (err) {
return err;
}
return count;
}
static int radio_reset_telit(void)
{
int ret;
struct gpio_pin *rst_pin = gpio_pin_by_name("3G_RST");
struct gpio_pin *onoff_pin = gpio_pin_by_name("3G_ONOFF");
if (!rst_pin || !onoff_pin) {
return -ENODEV;
}
// drive reset pin low for 500ms
ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 0, rst_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
msleep(500);
// set pin high
ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 1, rst_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
// wait for 2 sec before toggling on/off pin
msleep(2000);
// drive on/off pin low for 6 sec
ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 0, onoff_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
msleep(6000);
// set on/off pin high
ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 1, onoff_pin->pin.flags & GPIOF_PULLUP);
if (ret) {
return ret;
}
return ret;
}
static ssize_t mts_attr_store_radio_reset_telit(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int value;
int err;
if (sscanf(buf, "%i", &value) != 1) {
return -EINVAL;
}
if (value != 0) {
return -EINVAL;
}
mutex_lock(&mts_io_mutex);
err = radio_reset_telit();
mutex_unlock(&mts_io_mutex);
if (err) {
return err;
}
return count;
}
static DEVICE_ATTR_MTS(dev_attr_radio_power_telit, "radio-power",
mts_attr_show_gpio_pin, mts_attr_store_radio_power_telit);
static DEVICE_ATTR_MTS(dev_attr_radio_reset_telit, "radio-reset",
mts_attr_show_gpio_pin, mts_attr_store_radio_reset_telit);
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