openwrt/target/linux/generic/patches-3.9/880-gateworks_system_controller.patch

--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -444,6 +444,15 @@ config SENSORS_GL520SM
 	  This driver can also be built as a module.  If so, the module
 	  will be called gl520sm.
 
+config SENSORS_GSC
+	tristate "Gateworks System Controller"
+	depends on I2C
+	help
+	  If you say yes here you get support for the Gateworks System Controller.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called gsc.
+
 config SENSORS_GPIO_FAN
 	tristate "GPIO fan"
 	depends on GPIOLIB
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -134,6 +134,7 @@ obj-$(CONFIG_SENSORS_W83L785TS)	+= w83l7
 obj-$(CONFIG_SENSORS_W83L786NG)	+= w83l786ng.o
 obj-$(CONFIG_SENSORS_WM831X)	+= wm831x-hwmon.o
 obj-$(CONFIG_SENSORS_WM8350)	+= wm8350-hwmon.o
+obj-$(CONFIG_SENSORS_GSC)	+= gsc.o
 
 obj-$(CONFIG_PMBUS)		+= pmbus/
 
--- /dev/null
+++ b/drivers/hwmon/gsc.c
@@ -0,0 +1,308 @@
+/*
+ * A hwmon driver for the Gateworks System Controller 
+ * Copyright (C) 2009 Gateworks Corporation
+ *
+ * Author: Chris Lang <clang@gateworks.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License,
+ * as published by the Free Software Foundation - version 2.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+#define DRV_VERSION "0.2"
+
+enum chips { gsp };
+
+/* AD7418 registers */
+#define GSP_REG_TEMP_IN		0x00
+#define GSP_REG_VIN		0x02
+#define GSP_REG_3P3		0x05
+#define GSP_REG_BAT		0x08
+#define GSP_REG_5P0		0x0b
+#define GSP_REG_CORE		0x0e
+#define GSP_REG_CPU1		0x11
+#define GSP_REG_CPU2		0x14
+#define GSP_REG_DRAM		0x17
+#define GSP_REG_EXT_BAT		0x1a
+#define GSP_REG_IO1		0x1d
+#define GSP_REG_IO2 		0x20
+#define GSP_REG_PCIE		0x23
+#define GSP_REG_CURRENT		0x26
+#define GSP_FAN_0		0x2C
+#define GSP_FAN_1		0x2E
+#define GSP_FAN_2		0x30
+#define GSP_FAN_3		0x32
+#define GSP_FAN_4		0x34
+#define GSP_FAN_5		0x36
+
+struct gsp_sensor_info {
+	const char* name;
+	int reg;
+};
+
+static const struct gsp_sensor_info gsp_sensors[] = {
+	{"temp", GSP_REG_TEMP_IN},
+	{"vin", GSP_REG_VIN},
+	{"3p3", GSP_REG_3P3},
+	{"bat", GSP_REG_BAT},
+	{"5p0", GSP_REG_5P0},
+	{"core", GSP_REG_CORE},
+	{"cpu1", GSP_REG_CPU1},
+	{"cpu2", GSP_REG_CPU2},
+	{"dram", GSP_REG_DRAM},
+	{"ext_bat", GSP_REG_EXT_BAT},
+	{"io1", GSP_REG_IO1},
+	{"io2", GSP_REG_IO2},
+	{"pci2", GSP_REG_PCIE},
+	{"current", GSP_REG_CURRENT},
+	{"fan_point0", GSP_FAN_0},
+	{"fan_point1", GSP_FAN_1},
+	{"fan_point2", GSP_FAN_2},
+	{"fan_point3", GSP_FAN_3},
+	{"fan_point4", GSP_FAN_4},
+	{"fan_point5", GSP_FAN_5},
+};
+
+struct gsp_data {
+	struct device		*hwmon_dev;
+	struct attribute_group	attrs;
+	enum chips		type;
+};
+
+static int gsp_probe(struct i2c_client *client,
+			const struct i2c_device_id *id);
+static int gsp_remove(struct i2c_client *client);
+
+static const struct i2c_device_id gsp_id[] = {
+	{ "gsp", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, gsp_id);
+
+static struct i2c_driver gsp_driver = {
+	.driver = {
+		.name	= "gsp",
+	},
+	.probe		= gsp_probe,
+	.remove		= gsp_remove,
+	.id_table	= gsp_id,
+};
+
+/* All registers are word-sized, except for the configuration registers.
+ * AD7418 uses a high-byte first convention. Do NOT use those functions to
+ * access the configuration registers CONF and CONF2, as they are byte-sized.
+ */
+static inline int gsp_read(struct i2c_client *client, u8 reg)
+{
+	unsigned int adc = 0;
+	if (reg == GSP_REG_TEMP_IN || reg > GSP_REG_CURRENT)
+	{
+		adc |= i2c_smbus_read_byte_data(client, reg);
+		adc |= i2c_smbus_read_byte_data(client, reg + 1) << 8;
+		return adc;
+	}
+	else
+	{
+		adc |= i2c_smbus_read_byte_data(client, reg);
+		adc |= i2c_smbus_read_byte_data(client, reg + 1) << 8;
+		adc |= i2c_smbus_read_byte_data(client, reg + 2) << 16;
+		return adc;
+	}
+}
+
+static inline int gsp_write(struct i2c_client *client, u8 reg, u16 value)
+{
+	i2c_smbus_write_byte_data(client, reg, value & 0xff);
+	i2c_smbus_write_byte_data(client, reg + 1, ((value >> 8) & 0xff));
+	return 1;
+}
+
+static ssize_t show_adc(struct device *dev, struct device_attribute *devattr,
+			char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	return sprintf(buf, "%d\n", gsp_read(client, gsp_sensors[attr->index].reg));
+}
+
+static ssize_t show_label(struct device *dev,
+			struct device_attribute *devattr, char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+
+	return sprintf(buf, "%s\n", gsp_sensors[attr->index].name);
+}
+
+static ssize_t store_fan(struct device *dev,
+			struct device_attribute *devattr, const char *buf, size_t count)
+{
+	u16 val;
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct i2c_client *client = to_i2c_client(dev);
+	val = simple_strtoul(buf, NULL, 10);
+	gsp_write(client, gsp_sensors[attr->index].reg, val);
+	return count;
+}
+
+static SENSOR_DEVICE_ATTR(temp0_input, S_IRUGO, show_adc, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp0_label, S_IRUGO, show_label, NULL, 0);
+
+static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_adc, NULL, 1);
+static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, 1);
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 2);
+static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_label, NULL, 2);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 3);
+static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_label, NULL, 3);
+static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 4);
+static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 4);
+static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 5);
+static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL, 5);
+static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_adc, NULL, 6);
+static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL, 6);
+static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_adc, NULL, 7);
+static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL, 7);
+static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, show_adc, NULL, 8);
+static SENSOR_DEVICE_ATTR(in7_label, S_IRUGO, show_label, NULL, 8);
+static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, show_adc, NULL, 9);
+static SENSOR_DEVICE_ATTR(in8_label, S_IRUGO, show_label, NULL, 9);
+static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, show_adc, NULL, 10);
+static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, 10);
+static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, show_adc, NULL, 11);
+static SENSOR_DEVICE_ATTR(in10_label, S_IRUGO, show_label, NULL, 11);
+static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, show_adc, NULL, 12);
+static SENSOR_DEVICE_ATTR(in11_label, S_IRUGO, show_label, NULL, 12);
+static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, show_adc, NULL, 13);
+static SENSOR_DEVICE_ATTR(in12_label, S_IRUGO, show_label, NULL, 13);
+
+static SENSOR_DEVICE_ATTR(fan0_point0, S_IRUGO | S_IWUSR, show_adc, store_fan, 14);
+static SENSOR_DEVICE_ATTR(fan0_point1, S_IRUGO | S_IWUSR, show_adc, store_fan, 15);
+static SENSOR_DEVICE_ATTR(fan0_point2, S_IRUGO | S_IWUSR, show_adc, store_fan, 16);
+static SENSOR_DEVICE_ATTR(fan0_point3, S_IRUGO | S_IWUSR, show_adc, store_fan, 17);
+static SENSOR_DEVICE_ATTR(fan0_point4, S_IRUGO | S_IWUSR, show_adc, store_fan, 18);
+static SENSOR_DEVICE_ATTR(fan0_point5, S_IRUGO | S_IWUSR, show_adc, store_fan, 19);
+
+static struct attribute *gsp_attributes[] = {
+	&sensor_dev_attr_temp0_input.dev_attr.attr,
+	&sensor_dev_attr_in0_input.dev_attr.attr,
+	&sensor_dev_attr_in1_input.dev_attr.attr,
+	&sensor_dev_attr_in2_input.dev_attr.attr,
+	&sensor_dev_attr_in3_input.dev_attr.attr,
+	&sensor_dev_attr_in4_input.dev_attr.attr,
+	&sensor_dev_attr_in5_input.dev_attr.attr,
+	&sensor_dev_attr_in6_input.dev_attr.attr,
+	&sensor_dev_attr_in7_input.dev_attr.attr,
+	&sensor_dev_attr_in8_input.dev_attr.attr,
+	&sensor_dev_attr_in9_input.dev_attr.attr,
+	&sensor_dev_attr_in10_input.dev_attr.attr,
+	&sensor_dev_attr_in11_input.dev_attr.attr,
+	&sensor_dev_attr_in12_input.dev_attr.attr,
+
+	&sensor_dev_attr_temp0_label.dev_attr.attr,
+	&sensor_dev_attr_in0_label.dev_attr.attr,
+	&sensor_dev_attr_in1_label.dev_attr.attr,
+	&sensor_dev_attr_in2_label.dev_attr.attr,
+	&sensor_dev_attr_in3_label.dev_attr.attr,
+	&sensor_dev_attr_in4_label.dev_attr.attr,
+	&sensor_dev_attr_in5_label.dev_attr.attr,
+	&sensor_dev_attr_in6_label.dev_attr.attr,
+	&sensor_dev_attr_in7_label.dev_attr.attr,
+	&sensor_dev_attr_in8_label.dev_attr.attr,
+	&sensor_dev_attr_in9_label.dev_attr.attr,
+	&sensor_dev_attr_in10_label.dev_attr.attr,
+	&sensor_dev_attr_in11_label.dev_attr.attr,
+	&sensor_dev_attr_in12_label.dev_attr.attr,
+
+	&sensor_dev_attr_fan0_point0.dev_attr.attr,
+	&sensor_dev_attr_fan0_point1.dev_attr.attr,
+	&sensor_dev_attr_fan0_point2.dev_attr.attr,
+	&sensor_dev_attr_fan0_point3.dev_attr.attr,
+	&sensor_dev_attr_fan0_point4.dev_attr.attr,
+	&sensor_dev_attr_fan0_point5.dev_attr.attr,
+	NULL
+};
+
+
+static int gsp_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct i2c_adapter *adapter = client->adapter;
+	struct gsp_data *data;
+	int err;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
+					I2C_FUNC_SMBUS_WORD_DATA)) {
+		err = -EOPNOTSUPP;
+		goto exit;
+	}
+
+	if (!(data = kzalloc(sizeof(struct gsp_data), GFP_KERNEL))) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	i2c_set_clientdata(client, data);
+
+	data->type = id->driver_data;
+
+	switch (data->type) {
+	case 0:
+		data->attrs.attrs = gsp_attributes;
+		break;
+	}
+
+	dev_info(&client->dev, "%s chip found\n", client->name);
+
+	/* Register sysfs hooks */
+	if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs)))
+		goto exit_free;
+
+	data->hwmon_dev = hwmon_device_register(&client->dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		err = PTR_ERR(data->hwmon_dev);
+		goto exit_remove;
+	}
+
+	return 0;
+
+exit_remove:
+	sysfs_remove_group(&client->dev.kobj, &data->attrs);
+exit_free:
+	kfree(data);
+exit:
+	return err;
+}
+
+static int gsp_remove(struct i2c_client *client)
+{
+	struct gsp_data *data = i2c_get_clientdata(client);
+	hwmon_device_unregister(data->hwmon_dev);
+	sysfs_remove_group(&client->dev.kobj, &data->attrs);
+	kfree(data);
+	return 0;
+}
+
+static int __init gsp_init(void)
+{
+	return i2c_add_driver(&gsp_driver);
+}
+
+static void __exit gsp_exit(void)
+{
+	i2c_del_driver(&gsp_driver);
+}
+
+module_init(gsp_init);
+module_exit(gsp_exit);
+
+MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
+MODULE_DESCRIPTION("GSC HWMON driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+