add mtdc_gpiob.c

1 files changed, 270 insertions, 0 deletions

diff --git a/io-module/mtdc_gpiob.c b/io-module/mtdc_gpiob.c
new file mode 100644
index 0000000..c207483
--- /dev/null
+++ b/io-module/mtdc_gpiob.c
@@ -0,0 +1,270 @@
+
+struct gpio_pin *dc_gpio_pin_by_attr_name(const char *name) {
+	struct gpio_pin *pin;
+	char *pin_attr_name;
+
+	if (!strcmp(name, "led1")) {
+		pin_attr_name = "dc-gpio1";
+	} else if (!strcmp(name, "led2")) {
+		pin_attr_name = "dc-gpio2";
+	} else if (!strcmp(name, "dout-enable")) {
+		pin_attr_name = "dc-gpio3";
+	} else {
+		log_error("daughter card attribute %s not available", name);
+		return NULL;
+	}
+
+	for (pin = gpio_pins; *pin->name; pin++) {
+		if (!strcmp(pin->pin.label, pin_attr_name)) {
+			return pin;
+		}
+	}
+
+	log_error("pin with attr name %s not found", name);
+
+	return NULL;
+}
+
+
+static ssize_t mts_attr_show_dc_gpio_pin(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	int value;
+	struct gpio_pin *pin = dc_gpio_pin_by_attr_name(attr->attr.name);
+
+	if (!pin) {
+		return -ENODEV;
+	}
+
+	mutex_lock(&mts_io_mutex);
+
+	value = gpio_get_value(pin->pin.gpio);
+
+	mutex_unlock(&mts_io_mutex);
+
+	if (value < 0) {
+		return value;
+	}
+
+	if (pin->active_low) {
+		value = !value;
+	}
+
+	return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t mts_attr_store_dc_gpio_pin(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	int value;
+	struct gpio_pin *pin = dc_gpio_pin_by_attr_name(attr->attr.name);
+
+	if (!pin) {
+		return -ENODEV;
+	}
+
+	if (sscanf(buf, "%i", &value) != 1) {
+		return -EINVAL;
+	}
+
+	if (pin->active_low) {
+		value = !value;
+	}
+
+	mutex_lock(&mts_io_mutex);
+
+	gpio_set_value(pin->pin.gpio, value);
+
+	mutex_unlock(&mts_io_mutex);
+
+	return count;
+}
+
+static ssize_t mts_attr_show_dc_din(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	int tmp;
+	u8 bit;
+	u8 byte;
+
+	if (!spi_dc_din_dev) {
+		log_error("dc din device not present");
+		return -ENODEV;
+	}
+
+	if (!strcmp(attr->attr.name, "din0")) {
+		bit = BIT(0);
+	} else if (!strcmp(attr->attr.name, "din1")) {
+		bit = BIT(1);
+	} else if (!strcmp(attr->attr.name, "din2")) {
+		bit = BIT(2);
+	} else if (!strcmp(attr->attr.name, "din3")) {
+		bit = BIT(3);
+	} else {
+		log_error("dc din attr does not exist");
+		return -ENOENT;
+	}
+
+	tmp = spi_readn(spi_dc_din_dev, &byte, 1);
+	if (tmp) {
+		log_error("spi_read failed %d", tmp);
+		return tmp;
+	}
+
+	tmp = byte & bit ? 1 : 0;
+
+	return sprintf(buf, "%d\n", tmp);
+}
+
+static ssize_t mts_attr_store_dc_dout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+	int value;
+	u8 bit;
+
+	if (!spi_dc_dout_dev) {
+		log_error("dc dout device not present");
+		return -ENODEV;
+	}
+
+	if (!strcmp(attr->attr.name, "dout0")) {
+		bit = BIT(0);
+	} else if (!strcmp(attr->attr.name, "dout1")) {
+		bit = BIT(1);
+	} else if (!strcmp(attr->attr.name, "dout2")) {
+		bit = BIT(2);
+	} else if (!strcmp(attr->attr.name, "dout3")) {
+		bit = BIT(3);
+	} else {
+		log_error("dc dout attr does not exist");
+		return -ENOENT;
+	}
+
+	if (sscanf(buf, "%i", &value) != 1) {
+		log_error("dc dout attr invalid argument");
+		return -EINVAL;
+	}
+
+	mutex_lock(&spi_dc_dout_mutex);
+
+	if (value) {
+		spi_dc_dout_value &= ~bit;
+	} else {
+		spi_dc_dout_value |= bit;
+	}
+
+	spi_writen(spi_dc_dout_dev, &spi_dc_dout_value, 1);
+
+	mutex_unlock(&spi_dc_dout_mutex);
+
+	return count;
+}
+
+static ssize_t mts_attr_show_dc_dout(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	int value;
+	u8 bit;
+
+	if (!spi_dc_dout_dev) {
+		log_error("dc dout device not present");
+		return -ENODEV;
+	}
+
+	if (!strcmp(attr->attr.name, "dout0")) {
+		bit = BIT(0);
+	} else if (!strcmp(attr->attr.name, "dout1")) {
+		bit = BIT(1);
+	} else if (!strcmp(attr->attr.name, "dout2")) {
+		bit = BIT(2);
+	} else if (!strcmp(attr->attr.name, "dout3")) {
+		bit = BIT(3);
+	} else {
+		log_error("dc dout attr does not exist");
+		return -ENOENT;
+	}
+
+	mutex_lock(&spi_dc_dout_mutex);
+
+	value = spi_dc_dout_value & bit ? 0 : 1;
+
+	mutex_unlock(&spi_dc_dout_mutex);
+
+	return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t mts_attr_show_dc_adc(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	int tmp;
+	int tx_data;
+	int rx_data;
+	int channel;
+	int channel_mask = 0x0180;  /* 0b 0000 0001 1000 0000 */
+	int manual_mode = 0x1840;   /* 0b 0001 1000 0100 0000 */
+	uint8_t tx[2];
+	uint8_t rx[2];
+
+	if (!spi_dc_adc_dev) {
+		log_error("dc adc device not present");
+		return -ENODEV;
+	}
+
+	memset(tx, 0, sizeof(tx));
+	memset(rx, 0, sizeof(rx));
+
+	if (!strcmp(attr->attr.name, "adc0")) {
+		channel = 0;
+	} else if (!strcmp(attr->attr.name, "adc1")) {
+		channel = 1;
+	} else if (! strcmp(attr->attr.name, "adc2")) {
+		channel = 2;
+	} else {
+		log_error("dc adc attr does not exist");
+		return -ENOENT;
+	}
+
+	/* 1st transfer to set up (5V reference, channel to read from) */
+	tx_data = manual_mode | ((channel << 7) & channel_mask);
+	tx[0] = tx_data >> 8;
+	tx[1] = tx_data & 0xFF;
+	tmp = spi_writen(spi_dc_adc_dev, tx, 2);
+	if (tmp) {
+		log_error("spi_write failed %d", tmp);
+		return tmp;
+	}
+
+	/* 2nd transfer to clock chip for ADC conversion
+	 * this can be a throw-away read or an empty write,
+	 * the ADC just needs the clock running so it can convert */
+	tx[0] = 0;
+	tx[1] = 0;
+	tmp = spi_writen(spi_dc_adc_dev, tx, 2);
+	if (tmp) {
+		log_error("2nd spi_write failed %d", tmp);
+		return tmp;
+	}
+
+	/* 3rd transfer to read data */
+	tmp = spi_readn(spi_dc_adc_dev, rx, 2);
+	if (tmp) {
+		log_error("spi_read failed %d", tmp);
+		return tmp;
+	}
+	rx_data = ((rx[0] & 0x0F) << 8) | (rx[1] & 0xFF);
+
+	return sprintf(buf, "%lu\n", (unsigned long) rx_data);
+}
+
+/* MTDC-GPIOB */
+static DEVICE_ATTR_RO_MTS(dev_attr_dc_din0, "din0", mts_attr_show_dc_din);
+static DEVICE_ATTR_RO_MTS(dev_attr_dc_din1, "din1", mts_attr_show_dc_din);
+static DEVICE_ATTR_RO_MTS(dev_attr_dc_din2, "din2", mts_attr_show_dc_din);
+static DEVICE_ATTR_RO_MTS(dev_attr_dc_din3, "din3", mts_attr_show_dc_din);
+static DEVICE_ATTR_MTS(dev_attr_dc_dout0, "dout0", mts_attr_show_dc_dout, mts_attr_store_dc_dout);
+static DEVICE_ATTR_MTS(dev_attr_dc_dout1, "dout1", mts_attr_show_dc_dout, mts_attr_store_dc_dout);
+static DEVICE_ATTR_MTS(dev_attr_dc_dout2, "dout2", mts_attr_show_dc_dout, mts_attr_store_dc_dout);
+static DEVICE_ATTR_MTS(dev_attr_dc_dout3, "dout3", mts_attr_show_dc_dout, mts_attr_store_dc_dout);
+static DEVICE_ATTR_RO_MTS(dev_attr_dc_adc0, "adc0", mts_attr_show_dc_adc);
+static DEVICE_ATTR_RO_MTS(dev_attr_dc_adc1, "adc1", mts_attr_show_dc_adc);
+static DEVICE_ATTR_RO_MTS(dev_attr_dc_adc2, "adc2", mts_attr_show_dc_adc);
+static DEVICE_ATTR_MTS(dev_attr_dc_led1, "led1", mts_attr_show_dc_gpio_pin, mts_attr_store_dc_gpio_pin);
+static DEVICE_ATTR_MTS(dev_attr_dc_led2, "led2", mts_attr_show_dc_gpio_pin, mts_attr_store_dc_gpio_pin);
+static DEVICE_ATTR_MTS(dev_attr_dc_oe, "dout-enable", mts_attr_show_dc_gpio_pin, mts_attr_store_dc_gpio_pin);