hwmon: Add Ultra45 workstation hwmon driver.

This is a PIC16F747 based controller that monitors and consolidates
the hardware access to various fan and temperature values reported by
adr7462 and similar devices behind an I2C bus.

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 328 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index d402e8d813c..89765dd9aad 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -791,6 +791,13 @@ config SENSORS_W83627EHF
 	  This driver can also be built as a module.  If so, the module
 	  will be called w83627ehf.
 
+config SENSORS_ULTRA45
+	tristate "Sun Ultra45 PIC16F747"
+	depends on SPARC64
+	help
+	  This driver provides support for the Ultra45 workstation environmental
+	  sensors.
+
 config SENSORS_HDAPS
 	tristate "IBM Hard Drive Active Protection System (hdaps)"
 	depends on INPUT && X86
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 950134ab842..ee511ecf1df 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_SENSORS_FSCHMD)	+= fschmd.o
 obj-$(CONFIG_SENSORS_FSCPOS)	+= fscpos.o
 obj-$(CONFIG_SENSORS_GL518SM)	+= gl518sm.o
 obj-$(CONFIG_SENSORS_GL520SM)	+= gl520sm.o
+obj-$(CONFIG_SENSORS_ULTRA45)	+= ultra45_env.o
 obj-$(CONFIG_SENSORS_HDAPS)	+= hdaps.o
 obj-$(CONFIG_SENSORS_I5K_AMB)	+= i5k_amb.o
 obj-$(CONFIG_SENSORS_IBMAEM)	+= ibmaem.o
diff --git a/drivers/hwmon/ultra45_env.c b/drivers/hwmon/ultra45_env.c
new file mode 100644
index 00000000000..9aec95cbf7e
--- /dev/null
+++ b/drivers/hwmon/ultra45_env.c
@@ -0,0 +1,320 @@
+/* ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/of_device.h>
+#include <linux/io.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+#define DRV_MODULE_VERSION	"0.1"
+
+MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
+MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_MODULE_VERSION);
+
+/* PIC device registers */
+#define REG_CMD		0x00UL
+#define  REG_CMD_RESET	0x80
+#define  REG_CMD_ESTAR	0x01
+#define REG_STAT	0x01UL
+#define  REG_STAT_FWVER	0xf0
+#define  REG_STAT_TGOOD	0x08
+#define  REG_STAT_STALE	0x04
+#define  REG_STAT_BUSY	0x02
+#define  REG_STAT_FAULT	0x01
+#define REG_DATA	0x40UL
+#define REG_ADDR	0x41UL
+#define REG_SIZE	0x42UL
+
+/* Registers accessed indirectly via REG_DATA/REG_ADDR */
+#define IREG_FAN0		0x00
+#define IREG_FAN1		0x01
+#define IREG_FAN2		0x02
+#define IREG_FAN3		0x03
+#define IREG_FAN4		0x04
+#define IREG_FAN5		0x05
+#define IREG_LCL_TEMP		0x06
+#define IREG_RMT1_TEMP		0x07
+#define IREG_RMT2_TEMP		0x08
+#define IREG_RMT3_TEMP		0x09
+#define IREG_LM95221_TEMP	0x0a
+#define IREG_FIRE_TEMP		0x0b
+#define IREG_LSI1064_TEMP	0x0c
+#define IREG_FRONT_TEMP		0x0d
+#define IREG_FAN_STAT		0x0e
+#define IREG_VCORE0		0x0f
+#define IREG_VCORE1		0x10
+#define IREG_VMEM0		0x11
+#define IREG_VMEM1		0x12
+#define IREG_PSU_TEMP		0x13
+
+struct env {
+	void __iomem	*regs;
+	spinlock_t	lock;
+
+	struct device	*hwmon_dev;
+};
+
+static u8 env_read(struct env *p, u8 ireg)
+{
+	u8 ret;
+
+	spin_lock(&p->lock);
+	writeb(ireg, p->regs + REG_ADDR);
+	ret = readb(p->regs + REG_DATA);
+	spin_unlock(&p->lock);
+
+	return ret;
+}
+
+static void env_write(struct env *p, u8 ireg, u8 val)
+{
+	spin_lock(&p->lock);
+	writeb(ireg, p->regs + REG_ADDR);
+	writeb(val, p->regs + REG_DATA);
+	spin_unlock(&p->lock);
+}
+
+/* There seems to be a adr7462 providing these values, thus a lot
+ * of these calculations are borrowed from the adt7470 driver.
+ */
+#define FAN_PERIOD_TO_RPM(x)	((90000 * 60) / (x))
+#define FAN_RPM_TO_PERIOD	FAN_PERIOD_TO_RPM
+#define FAN_PERIOD_INVALID	(0xff << 8)
+#define FAN_DATA_VALID(x)	((x) && (x) != FAN_PERIOD_INVALID)
+
+static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	int fan_nr = to_sensor_dev_attr(attr)->index;
+	struct env *p = dev_get_drvdata(dev);
+	int rpm, period;
+	u8 val;
+
+	val = env_read(p, IREG_FAN0 + fan_nr);
+	period = (int) val << 8;
+	if (FAN_DATA_VALID(period))
+		rpm = FAN_PERIOD_TO_RPM(period);
+	else
+		rpm = 0;
+
+	return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t count)
+{
+	int fan_nr = to_sensor_dev_attr(attr)->index;
+	int rpm = simple_strtol(buf, NULL, 10);
+	struct env *p = dev_get_drvdata(dev);
+	int period;
+	u8 val;
+
+	if (!rpm)
+		return -EINVAL;
+
+	period = FAN_RPM_TO_PERIOD(rpm);
+	val = period >> 8;
+	env_write(p, IREG_FAN0 + fan_nr, val);
+
+	return count;
+}
+
+static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	int fan_nr = to_sensor_dev_attr(attr)->index;
+	struct env *p = dev_get_drvdata(dev);
+	u8 val = env_read(p, IREG_FAN_STAT);
+	return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);
+}
+
+#define fan(index)							\
+static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR,	\
+		show_fan_speed, set_fan_speed, index);			\
+static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO,			\
+		show_fan_fault, NULL, index)
+
+fan(0);
+fan(1);
+fan(2);
+fan(3);
+fan(4);
+
+static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);
+
+static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	int temp_nr = to_sensor_dev_attr(attr)->index;
+	struct env *p = dev_get_drvdata(dev);
+	s8 val;
+
+	val = env_read(p, IREG_LCL_TEMP + temp_nr);
+	return sprintf(buf, "%d\n", ((int) val) - 64);
+}
+
+static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
+static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
+static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
+static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
+static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);
+
+static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	int index = to_sensor_dev_attr(attr)->index;
+	struct env *p = dev_get_drvdata(dev);
+	u8 val;
+
+	val = readb(p->regs + REG_STAT);
+	return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);
+}
+
+static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
+static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
+static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
+static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL, 3);
+
+static ssize_t show_fwver(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct env *p = dev_get_drvdata(dev);
+	u8 val;
+
+	val = readb(p->regs + REG_STAT);
+	return sprintf(buf, "%d\n", val >> 4);
+}
+
+static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);
+
+static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "ultra45\n");
+}
+
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
+
+static struct attribute *env_attributes[] = {
+	&sensor_dev_attr_fan0_speed.dev_attr.attr,
+	&sensor_dev_attr_fan0_fault.dev_attr.attr,
+	&sensor_dev_attr_fan1_speed.dev_attr.attr,
+	&sensor_dev_attr_fan1_fault.dev_attr.attr,
+	&sensor_dev_attr_fan2_speed.dev_attr.attr,
+	&sensor_dev_attr_fan2_fault.dev_attr.attr,
+	&sensor_dev_attr_fan3_speed.dev_attr.attr,
+	&sensor_dev_attr_fan3_fault.dev_attr.attr,
+	&sensor_dev_attr_fan4_speed.dev_attr.attr,
+	&sensor_dev_attr_fan4_fault.dev_attr.attr,
+	&sensor_dev_attr_psu_fan_fault.dev_attr.attr,
+	&sensor_dev_attr_adt7462_local_temp.dev_attr.attr,
+	&sensor_dev_attr_cpu0_temp.dev_attr.attr,
+	&sensor_dev_attr_cpu1_temp.dev_attr.attr,
+	&sensor_dev_attr_motherboard_temp.dev_attr.attr,
+	&sensor_dev_attr_lm95221_local_temp.dev_attr.attr,
+	&sensor_dev_attr_fire_temp.dev_attr.attr,
+	&sensor_dev_attr_lsi1064_local_temp.dev_attr.attr,
+	&sensor_dev_attr_front_panel_temp.dev_attr.attr,
+	&sensor_dev_attr_psu_temp.dev_attr.attr,
+	&sensor_dev_attr_fan_failure.dev_attr.attr,
+	&sensor_dev_attr_env_bus_busy.dev_attr.attr,
+	&sensor_dev_attr_env_data_stale.dev_attr.attr,
+	&sensor_dev_attr_tpm_self_test_passed.dev_attr.attr,
+	&sensor_dev_attr_firmware_version.dev_attr.attr,
+	&sensor_dev_attr_name.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group env_group = {
+	.attrs = env_attributes,
+};
+
+static int __devinit env_probe(struct of_device *op,
+			       const struct of_device_id *match)
+{
+	struct env *p = kzalloc(sizeof(*p), GFP_KERNEL);
+	int err = -ENOMEM;
+
+	if (!p)
+		goto out;
+
+	spin_lock_init(&p->lock);
+
+	p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");
+	if (!p->regs)
+		goto out_free;
+
+	err = sysfs_create_group(&op->dev.kobj, &env_group);
+	if (err)
+		goto out_iounmap;
+
+	p->hwmon_dev = hwmon_device_register(&op->dev);
+	if (IS_ERR(p->hwmon_dev)) {
+		err = PTR_ERR(p->hwmon_dev);
+		goto out_sysfs_remove_group;
+	}
+
+	dev_set_drvdata(&op->dev, p);
+	err = 0;
+
+out:
+	return err;
+
+out_sysfs_remove_group:
+	sysfs_remove_group(&op->dev.kobj, &env_group);
+
+out_iounmap:
+	of_iounmap(&op->resource[0], p->regs, REG_SIZE);
+
+out_free:
+	kfree(p);
+	goto out;
+}
+
+static int __devexit env_remove(struct of_device *op)
+{
+	struct env *p = dev_get_drvdata(&op->dev);
+
+	if (p) {
+		sysfs_remove_group(&op->dev.kobj, &env_group);
+		hwmon_device_unregister(p->hwmon_dev);
+		of_iounmap(&op->resource[0], p->regs, REG_SIZE);
+		kfree(p);
+	}
+
+	return 0;
+}
+
+static struct of_device_id env_match[] = {
+	{
+		.name = "env-monitor",
+		.compatible = "SUNW,ebus-pic16f747-env",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, env_match);
+
+static struct of_platform_driver env_driver = {
+	.name		= "ultra45_env",
+	.match_table	= env_match,
+	.probe		= env_probe,
+	.remove		= __devexit_p(env_remove),
+};
+
+static int __init env_init(void)
+{
+	return of_register_driver(&env_driver, &of_bus_type);
+}
+
+static void __exit env_exit(void)
+{
+	of_unregister_driver(&env_driver);
+}
+
+module_init(env_init);
+module_exit(env_exit);