The Gateworks System Controller (GSC) is an i2c device that provides system

level monitoring and control of Gateworks boards.  It is used on several
product families spanning several different target architectures (ixp4xx,
cns3xxx, davinci).

Signed-off-by: Tim Harvey <tharvey@gateworks.com>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33720 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 340 insertions, 0 deletions

diff --git a/target/linux/generic/config-3.3 b/target/linux/generic/config-3.3
index abf499ff2..e21e17f70 100644
--- a/target/linux/generic/config-3.3
+++ b/target/linux/generic/config-3.3
@@ -2491,6 +2491,7 @@ CONFIG_SELECT_MEMORY_MODEL=y
 # CONFIG_SENSORS_GL518SM is not set
 # CONFIG_SENSORS_GL520SM is not set
 # CONFIG_SENSORS_GPIO_FAN is not set
+# CONFIG_SENSORS_GSC is not set
 # CONFIG_SENSORS_HDAPS is not set
 # CONFIG_SENSORS_I5K_AMB is not set
 # CONFIG_SENSORS_IT87 is not set
diff --git a/target/linux/generic/patches-3.3/880-gateworks_system_controller.patch b/target/linux/generic/patches-3.3/880-gateworks_system_controller.patch
new file mode 100644
index 000000000..981610dad
--- /dev/null
+++ b/target/linux/generic/patches-3.3/880-gateworks_system_controller.patch
@@ -0,0 +1,339 @@
+--- a/drivers/hwmon/Kconfig
++++ b/drivers/hwmon/Kconfig
+@@ -423,6 +423,15 @@ 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 && (ARCH_DAVINCI || ARCH_CNS3XXX || ARCH_IXP4XX)
++	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 GENERIC_GPIO
+--- a/drivers/hwmon/Makefile
++++ b/drivers/hwmon/Makefile
+@@ -125,6 +125,7 @@ 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);
++