Create a driver to support the hardware monitoring chip present in
the Zyxel NSA320 and some of the other Zyxel NAS devices.
The driver reads fan speed and temperature from a suitably
pre-programmed MCU on the device.
Signed-off-by: Adam Baker <linux@xxxxxxxxxxxxxxxx>
---
drivers/hwmon/Kconfig | 15 +++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/nsa320-hwmon.c | 215 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 231 insertions(+)
create mode 100644 drivers/hwmon/nsa320-hwmon.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 80a73bf..08fd7f5 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1186,6 +1186,21 @@ config SENSORS_NCT7904
This driver can also be built as a module. If so, the module
will be called nct7904.
+config SENSORS_NSA320
+ tristate "ZyXEL NSA320 and compatible fan speed and temperature sensors"
+ depends on GPIOLIB && OF
+ depends on MACH_KIRKWOOD || COMPILE_TEST
+ help
+ If you say yes here you get support for hardware monitoring
+ for the ZyXEL NSA320 Media Server and other compatible devices
+ (probably the NSA325 and some NSA310 variants).
+
+ The sensor data is taken from a Holtek HT46R065 microcontroller
+ connected to GPIO lines.
+
+ This driver can also be built as a module. If so, the module
+ will be called nsa320-hwmon.
+
config SENSORS_PCF8591
tristate "Philips PCF8591 ADC/DAC"
depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 12a3239..e555d6d 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -125,6 +125,7 @@ obj-$(CONFIG_SENSORS_NCT6775) += nct6775.o
obj-$(CONFIG_SENSORS_NCT7802) += nct7802.o
obj-$(CONFIG_SENSORS_NCT7904) += nct7904.o
obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o
+obj-$(CONFIG_SENSORS_NSA320) += nsa320-hwmon.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
diff --git a/drivers/hwmon/nsa320-hwmon.c b/drivers/hwmon/nsa320-hwmon.c
new file mode 100644
index 0000000..f4bfa65
--- /dev/null
+++ b/drivers/hwmon/nsa320-hwmon.c
@@ -0,0 +1,215 @@
+/*
+ * drivers/hwmon/nsa320-hwmon.c
+ *
+ * ZyXEL NSA320 Media Servers
+ * hardware monitoring
+ *
+ * Copyright (C) 2016 Adam Baker <linux@xxxxxxxxxxxxxxxx>
+ * based on a board file driver
+ * Copyright (C) 2012 Peter Schildmann <linux@xxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License v2 as published by the
+ * Free Software Foundation.
+ *
+ * This program 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 General Public License for
+ * more details.
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#define MAGIC_NUMBER 0x55
+
+/*
+ * The Zyxel hwmon MCU is a Holtek HT46R065 that is factory programmed
+ * to perform temperature and fan speed monitoring. It is read by taking
+ * the active pin low. The 32 bit output word is then clocked onto the
+ * data line. The MSB of the data word is a magic nuber to indicate it
+ * has been read correctly, the next byte is the fan speed (in hundreds
+ * of RPM) and the last two bytes are the temperature (in tenths of a
+ * degree)
+ */
+
+struct nsa320_hwmon {
+ struct mutex update_lock; /* lock GPIO operations */
+ unsigned long last_updated; /* jiffies */
+ u32 mcu_data;
+ struct gpio_desc *act;
+ struct gpio_desc *clk;
+ struct gpio_desc *data;
+};
+
+enum nsa320_inputs {
+ NSA3XX_TEMP = 0,
+ NSA3XX_FAN = 1,
+};
+
+static const char * const nsa320_input_names[] = {
+ [NSA3XX_FAN] = "Chassis Fan",
+ [NSA3XX_TEMP] = "System Temperature",
+};
+
+/* Although this protocol looks similar to SPI the long delay
+ * between the active (aka chip select) signal and the shorter
+ * delay between clock pulses are needed for reliable operation.
+ * The delays provided are taken from the manufacturer kernel,
+ * testing suggest they probably incorporate a reasonable safety
+ * margin. (The single device tested became unreliable if the
+ * delay was reduced to 1/10th of this value.)
+ */
+static int nsa320_hwmon_update(struct device *dev)
+{
+ u32 mcu_data;
+ u32 mask;
+ struct nsa320_hwmon *hwmon = dev_get_drvdata(dev);
+
+ mutex_lock(&hwmon->update_lock);
+
+ mcu_data = hwmon->mcu_data;
+
+ if (time_after(jiffies, hwmon->last_updated + HZ) || mcu_data == 0) {
+ gpiod_set_value(hwmon->act, 1);
+ msleep(100);
+
+ for (mask = BIT(31); mask; mask >>= 1) {
+ gpiod_set_value(hwmon->clk, 0);
+ usleep_range(100, 200);
+ gpiod_set_value(hwmon->clk, 1);
+ usleep_range(100, 200);
+ if (gpiod_get_value(hwmon->data))
+ mcu_data |= mask;
+ }
+
+ gpiod_set_value(hwmon->act, 0);
+ dev_dbg(dev, "Read raw MCU data %08x\n", mcu_data);
+
+ if ((mcu_data >> 24) != MAGIC_NUMBER) {
+ dev_dbg(dev, "Read invalid MCU data %08x\n", mcu_data);
+ return -EIO;
+ }
+
+ hwmon->mcu_data = mcu_data;
+ hwmon->last_updated = jiffies;
+ }
+
+ mutex_unlock(&hwmon->update_lock);
+
+ return 0;
+}
+
+static ssize_t show_label(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int channel = to_sensor_dev_attr(attr)->index;
+
+ return sprintf(buf, "%s\n", nsa320_input_names[channel]);
+}
+
+static ssize_t show_value(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int channel = to_sensor_dev_attr(attr)->index;
+ struct nsa320_hwmon *hwmon = dev_get_drvdata(dev);
+ unsigned long value = 0;
+ int ret = nsa320_hwmon_update(dev);
+
+ if (ret)
+ return ret;
+
+ switch (channel) {
+ case NSA3XX_TEMP:
+ value = (hwmon->mcu_data & 0xffff) * 100;
+ break;
+ case NSA3XX_FAN:
+ value = ((hwmon->mcu_data & 0xff0000) >> 16) * 100;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return sprintf(buf, "%lu\n", value);
+}
+
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, NSA3XX_TEMP);
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_value, NULL, NSA3XX_TEMP);
+static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, show_label, NULL, NSA3XX_FAN);
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_value, NULL, NSA3XX_FAN);
+
+static struct attribute *nsa320_attrs[] = {
+ &sensor_dev_attr_temp1_label.dev_attr.attr,
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_fan1_label.dev_attr.attr,
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
+ NULL
+};
+
+ATTRIBUTE_GROUPS(nsa320);
+
+static const struct of_device_id of_nsa320_hwmon_match[] = {
+ { .compatible = "zyxel,nsa320-mcu", },
+ { },
+};
+
+static int nsa320_hwmon_probe(struct platform_device *pdev)
+{
+ struct nsa320_hwmon *hwmon;
+ struct device *classdev;
+
+ hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
+ if (!hwmon)
+ return -ENOMEM;
+
+ /* Look up the GPIO pins to use */
+ hwmon->act = devm_gpiod_get(&pdev->dev, "act", GPIOD_OUT_LOW);
+ if (IS_ERR(hwmon->act))
+ return PTR_ERR(hwmon->act);
+
+ hwmon->clk = devm_gpiod_get(&pdev->dev, "clk", GPIOD_OUT_HIGH);
+ if (IS_ERR(hwmon->clk))
+ return PTR_ERR(hwmon->clk);
+
+ hwmon->data = devm_gpiod_get(&pdev->dev, "data", GPIOD_IN);
+ if (IS_ERR(hwmon->data))
+ return PTR_ERR(hwmon->data);
+
+ mutex_init(&hwmon->update_lock);
+
+ classdev = devm_hwmon_device_register_with_groups(&pdev->dev,
+ "nsa320", hwmon, nsa320_groups);
+
+ return PTR_ERR_OR_ZERO(classdev);
+
+}
+
+/* All allocations use devres so remove() is not needed. */
+
+static struct platform_driver nsa320_hwmon_driver = {
+ .probe = nsa320_hwmon_probe,
+ .driver = {
+ .name = "nsa320-hwmon",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(of_nsa320_hwmon_match),
+ },
+};
+
+module_platform_driver(nsa320_hwmon_driver);
+
+MODULE_DEVICE_TABLE(of, of_nsa320_hwmon_match);
+MODULE_AUTHOR("Peter Schildmann <linux@xxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Adam Baker <linux@xxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("NSA3XX Hardware Monitoring");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:nsa320-hwmon");
--
2.1.4
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