path: root/io-module/machine/mtcap3.c

#define NXP_GPIO(BANK, IO) (((( BANK - 1 ) * 32) + IO))

/* Used for both mtcap3 0.0 and 0.1 */
static struct gpio_pin gpio_pins_mtcap3_0_0[] = {
	{
		.name = "ETH_RESET",
		.pin = {
			.gpio = NXP_GPIO(1, 4), // ETH_NRST - has ext PU
			.flags = GPIOF_OUT_INIT_HIGH, 
			.label = "eth-reset",
		},
        // mts-io in init leaves eth-reset asserted even though it is really
        // an nrst pin, and does this across boards. This is wrong logically, 
        // but active_low must be 0 as legacy and for this to function properly.
        .active_low = 0, 
	},
	{
		.name = "RADIO_POWER_MONITOR",
		.pin = {
			.gpio = NXP_GPIO(4, 28), // CELL_STATUS
			.flags = GPIOF_IN,
			.label = "radio-power-monitor",
		},
	},
	{
		.name = "RADIO_RESET",
		.pin = {
			.gpio = NXP_GPIO(5, 4), // CELL_RESET - has ext PD - inverted through FET
			.flags = GPIOF_OUT_INIT_LOW,
			.label = "radio-reset",
		},
	},
	{
		.name = "RADIO_ONOFF",
		.pin = {
			.gpio = NXP_GPIO(5, 8), // CELL_ONOFF - has ext PD - inverted through FET
			.flags = GPIOF_OUT_INIT_HIGH,
			.label = "radio-onoff",
		},
	},
	{
		.name = "RADIO_POWER",
		.pin = {
			.gpio = NXP_GPIO(5, 0), // CELL_PWR_EN - has ext PD
			.flags = GPIOF_OUT_INIT_HIGH,
			.label = "radio-power",
		},
	},
	{
		.name = "RADIO_NETLIGHT", // LED4 is for cell network status 
		.pin = {
			.gpio = NXP_GPIO(4, 25),
			.flags = GPIOF_IN,
			.label = "radio-netlight",
		},
	},
	{
		.name = "DEVICE_RESET",
		.pin = {
			.gpio = NXP_GPIO(2, 13), // SWITCH_IN - has EXT PU
			.flags = GPIOF_IN,
			.label = "reset",
		},
		.active_low = 1,
	},
	{
		.name = "LORA_RESET",
		.pin = {
			.gpio = NXP_GPIO(1, 25), // LORA_RST
			.flags = GPIOF_OUT_INIT_LOW,
			.label = "lora/reset",
		},
		.capability = CAPA_LORA,
	},
	{
		.name = "LORA_LBT_RESET",
		.pin = {
			.gpio = NXP_GPIO(1, 27), // LORA_LBT_nRESET
			.flags = GPIOF_OUT_INIT_LOW,
			.label = "lora/lbt-reset",
		},
		.capability = CAPA_LORA_LBT,
		.active_low = 1,
	},
	/* LEDs */
	{
		.name = "STATUS_LED", // DEV_LED_GN
		.pin = {
			.gpio = NXP_GPIO(2, 15),
			.flags = GPIOF_OUT_INIT_HIGH,
			.label = "led-status",
		},
	},
	{
		.name = "LED2", // LED2 is for LoRa status
		.pin = {
			.gpio = NXP_GPIO(3, 21),
			.flags = GPIOF_OUT_INIT_LOW,
			.label = "led-lora",
		},
	},
	{
		.name = "LED3", // LED3 is for Cellular status (Modem can directly enable it)
		.pin = {
			.gpio = NXP_GPIO(3, 22),
			.flags = GPIOF_OUT_INIT_HIGH,
			.label = "led-cd",
		},
	},
	{
		.name = "LED4", // LED4 is for power status 
		.pin = {
			.gpio = NXP_GPIO(3, 23),
			.flags = GPIOF_OUT_INIT_LOW,
			.label = "led-power",
		},
	},
	// NXP_GPIO(3, 28), LED_EXTRA on the Rev 0 schem., is always on power
	{ },
};

// Note on EG95 reset logic: this code was adapted from radio.c in 
// RadioSupervisoryChips/STM8L101-MTQ.

// EG95 timings
#define EG95_PWRKEY_KEEPOUT_WAIT_MS (60)
#define EG95_PWRKEY_LOW_ON_WAIT_MS (540)  // >= 500ms in datasheet
#define EG95_PWRKEY_LOW_OFF_WAIT_MS (700) // >650ms in datasheet
#define EG95_POWER_MON_ON_WAIT_S (30)
#define EG95_POWER_MON_OFF_WAIT_S (35)
#define EG95_POWER_KEEPOUT_WAIT_MS (60)
#define EG95_RESET_N_WAIT_MS (300)

/* radio control (power/reset) for mtcap3 */
static int radio_off_mtcap3(void)
{
    int i = 0;
    int value = 0;
	struct gpio_pin *pwrmon_pin = gpio_pin_by_attr_name("radio-power-monitor");
	struct gpio_pin *onoff_pin = gpio_pin_by_attr_name("radio-onoff");
	struct gpio_pin *power_pin = gpio_pin_by_attr_name("radio-power");
    
    if (!onoff_pin || !pwrmon_pin) {
		return -ENODEV;
	}
	
    value = gpio_get_value(pwrmon_pin->pin.gpio);
	if(value == 0) {
		log_warning("cell radio is already off");
		return 0;
	}

    /* The reference manual indicates that PWRKEY is equivalent to AT+QPOWD */

	log_info("turning off cell radio");

    // Toggle PWRKEY - logic is reversed to the module through the FET
	gpio_set_value(onoff_pin->pin.gpio, 0);
    msleep(EG95_PWRKEY_KEEPOUT_WAIT_MS);
    gpio_set_value(onoff_pin->pin.gpio, 1);
    msleep(EG95_PWRKEY_LOW_OFF_WAIT_MS);
    gpio_set_value(onoff_pin->pin.gpio, 0);

    // Wait for module to indicate status
    for(i=0; i<=EG95_POWER_MON_OFF_WAIT_S; i++) {
        value = gpio_get_value(pwrmon_pin->pin.gpio);

        if(!value) {
            break;
        }

        msleep(1000);
    } 
    
    // disable power to the radio; We want to do this generally for 
    // battery powered MTCAP based devices.
    gpio_set_value(power_pin->pin.gpio, 0);
    msleep(EG95_POWER_KEEPOUT_WAIT_MS);
    
    if(value != 0) {
        log_warning("cell radio was still on.");
    } else {
        log_info("cell radio has been turned off");
    }

	return 0;
}

static int radio_on_mtcap3(void)
{
    int i = 0;
    int value = 0;
	struct gpio_pin *pwrmon_pin = gpio_pin_by_attr_name("radio-power-monitor");
	struct gpio_pin *onoff_pin = gpio_pin_by_attr_name("radio-onoff");
	struct gpio_pin *power_pin = gpio_pin_by_attr_name("radio-power");
	
    if (!onoff_pin || !pwrmon_pin || !power_pin) {
		return -ENODEV;
	}

    value = gpio_get_value(pwrmon_pin->pin.gpio);

	if(value != 0) {
		log_warning("cell radio is already on");
		return 0;
	}

	log_info("turning on cell radio");
    
    // Toggle PWRKEY - lgoic is reversed to the module through the FET
	gpio_set_value(onoff_pin->pin.gpio, 0);
    msleep(EG95_PWRKEY_KEEPOUT_WAIT_MS);

    // Enable power to the radio
    gpio_set_value(power_pin->pin.gpio, 1);
    msleep(EG95_POWER_KEEPOUT_WAIT_MS);

    gpio_set_value(onoff_pin->pin.gpio, 1);
    msleep(EG95_PWRKEY_LOW_ON_WAIT_MS);
    
    // Wait for module to inidcate status.
    // The spec says >= 10s, but MTQ code does 30; will be on the order of secs
    for(i=0; i<=EG95_POWER_MON_ON_WAIT_S; i++) {
        value = gpio_get_value(pwrmon_pin->pin.gpio);

        if(value) {
            break;
        }

        msleep(1000);
    } 
    
    // Set pwrkey high (through the FET switch); 
    // MTQ code does this after waiting for radio-power-monitor assert
    gpio_set_value(onoff_pin->pin.gpio, 0);
    
    if(value == 0) {
        log_warning("cell radio is still off.");
    } else {
        log_info("cell radio has been turned on");
    }

	return 0;
}

static ssize_t mts_attr_store_radio_power_mtcap3(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;
	}
	
    mutex_lock(&mts_io_mutex);
	if (value == 0) {
		err = radio_off_mtcap3();
	} else if (value == 1) {
		err = radio_on_mtcap3();
	} else {
        err = -EINVAL;
    }
	mutex_unlock(&mts_io_mutex);

	if (err) {
		return err;
	}

	return count;
}

// *_radio_enable_* is here for backward compatibility
static ssize_t mts_attr_store_radio_enable_mtcap3(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
    // Included for legacy compatibilty. The 'radio-power' object controls
    // power to the module, rather than 'enable.'  The radio is always 
    // enabled, and 'radio-power' mirrors the state of the regulator enable,
    // alleviating confusion, as well as ensuring clean shut down which 
    // reduce module failures. 
	return count;
}

static ssize_t mts_attr_show_radio_enable_mtcap3(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	return sprintf(buf, "%d\n", 1);
}

static ssize_t mts_attr_store_radio_reset_mtcap3(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
    int i;
	int value;
	struct gpio_pin *pwrmon_pin = gpio_pin_by_attr_name("radio-power-monitor");
	struct gpio_pin *reset_pin = gpio_pin_by_attr_name("radio-reset");
	
    if ( !pwrmon_pin || !reset_pin) {
		return -ENODEV;
	}

	value = gpio_get_value(pwrmon_pin->pin.gpio);
	if (sscanf(buf, "%i", &value) != 1) {
		return -EINVAL;
	}

	if (value != 0 && value != -1) {
		return -EINVAL;
	}

    reset_radio_udev_discovery();
    mutex_lock(&mts_io_mutex);

    radio_off_mtcap3();
    radio_on_mtcap3();

    value = gpio_get_value(pwrmon_pin->pin.gpio);
       
    // Ensure that the module status indicates that it is up
    if(!value) {
        // Something has gone wrong
        
		log_warning("cell radio not responding. Applying hard reset.");

        // The manual advises against doing this as it is disorderly
        // We do it here as a last resort.
        gpio_set_value(reset_pin->pin.gpio, 1);
        msleep(EG95_RESET_N_WAIT_MS);
        gpio_set_value(reset_pin->pin.gpio, 0);
    
        for(i=0; i<=EG95_POWER_MON_ON_WAIT_S; i++) {
            value = gpio_get_value(pwrmon_pin->pin.gpio);

            if(value) {
                break;
            }

            msleep(1000);
        } 
            
        if(value == 0) {
            log_warning("Unable to reset radio.");
        } else {
            log_info("cell radio has been reset");
        }
    }
    else
    {
        log_info("cell radio has been reset");
    }
	
    mutex_unlock(&mts_io_mutex);

	return count;
}

static ssize_t mts_attr_show_radio_power_mtcap3(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	int value;
	struct gpio_pin *pwrmon_pin = gpio_pin_by_attr_name("radio-power-monitor");
	
    if ( !pwrmon_pin) {
		return -ENODEV;
	}

	value = gpio_get_value(pwrmon_pin->pin.gpio);

	return sprintf(buf, "%d\n", value);
}

static DEVICE_ATTR_MTS(dev_attr_radio_reset_mtcap3, "radio-reset",
		mts_attr_show_gpio_pin, mts_attr_store_radio_reset_mtcap3);

static DEVICE_ATTR_MTS(dev_attr_radio_power_mtcap3, "radio-power",
		mts_attr_show_radio_power_mtcap3, mts_attr_store_radio_power_mtcap3);

static DEVICE_ATTR_RO_MTS(dev_attr_radio_power_monitor_mtcap3, "radio-power-monitor",
		mts_attr_show_gpio_pin);

static DEVICE_ATTR_MTS(dev_attr_eth_reset_mtcap3, "eth-reset",
		mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);

static DEVICE_ATTR_MTS(dev_attr_led_lora_gpio_mtcap3, "led-lora",
		mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);

// here to maintain compatiblility
static DEVICE_ATTR_MTS(dev_attr_radio_enable_mtcap3, "radio-enable",
	mts_attr_show_radio_enable_mtcap3, mts_attr_store_radio_enable_mtcap3);

static DEVICE_ATTR_MTS(dev_attr_led_power_gpio_mtcap3, "led-power",
		mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);


static struct attribute *mtcap3_0_0_platform_attributes[] = {
		&dev_attr_vendor_id.attr,
		&dev_attr_product_id.attr,
		&dev_attr_device_id.attr,
		&dev_attr_uuid.attr,
		&dev_attr_hw_version.attr,
		&dev_attr_imei.attr,
		&dev_attr_eth_mac.attr,
		&dev_attr_has_radio.attr,
		&dev_attr_reset.attr,
		&dev_attr_reset_monitor.attr,
		&dev_attr_reset_monitor_intervals.attr,

		&dev_attr_eth_reset_mtcap3.attr,
		&dev_attr_led_status.attr,
		&dev_attr_led_cd_gpio.attr,
		&dev_attr_led_lora_gpio_mtcap3.attr,
		&dev_attr_led_power_gpio_mtcap3.attr,

		/* Set to NULL if no radio -- should be 1st radio attribute */
		&dev_attr_radio_reset_mtcap3.attr,
		&dev_attr_radio_power_mtcap3.attr,
		&dev_attr_radio_power_monitor_mtcap3.attr,

		&dev_attr_radio_reset_backoffs.attr,
		&dev_attr_radio_reset_backoff_index.attr,
		&dev_attr_radio_reset_backoff_seconds.attr,

                &dev_attr_radio_enable_mtcap3.attr,

		// UDEV notification of radio discovery
		&dev_attr_radio_udev_discovery.attr,
		&dev_attr_radio_reset_monitor.attr,
		NULL,
};

static int 
is_radio_power_attr_mtcap3(struct attribute *attr)
{
    return (attr ==  &dev_attr_radio_power_mtcap3.attr);
}

static struct attribute_group mtcap3_0_0_platform_attribute_group = {
	.attrs = mtcap3_0_0_platform_attributes
};

//
// on-board LORA attributes are to be stored in the lora/ sub-directory
//
//
static DEVICE_ATTR_MTS(dev_attr_lora_reset_mtcap3, "reset",
		mts_attr_show_lora_gpio_pin, mts_attr_store_lora_gpio_pin);

static DEVICE_ATTR_MTS(dev_attr_lora_lbt_reset_mtcap3, "lbt-reset",
		mts_attr_show_lora_gpio_pin, mts_attr_store_lora_gpio_pin);

static DEVICE_ATTR_RO_MTS(dev_attr_lora_eui_mtcap3, "eui",
		mts_attr_show_lora_product_info);

static DEVICE_ATTR_RO_MTS(dev_attr_lora_product_id_mtcap3, "product-id",
		mts_attr_show_lora_product_info);

static DEVICE_ATTR_RO_MTS(dev_attr_lora_hw_version_mtcap3, "hw-version",
		mts_attr_show_lora_product_info);

static struct attribute *mtcap3_0_0_lora_attributes[] = {
		&dev_attr_lora_eui_mtcap3.attr,
		&dev_attr_lora_product_id_mtcap3.attr,
		&dev_attr_lora_hw_version_mtcap3.attr,
		&dev_attr_lora_reset_mtcap3.attr,
		NULL,
};

static struct attribute_group mtcap3_0_0_lora_attribute_group = {
	.attrs = mtcap3_0_0_lora_attributes
};

static struct attribute *mtcap3_0_0_lora_lbt_attributes[] = {
		&dev_attr_lora_lbt_reset_mtcap3.attr,
};