hwmon: Add Ultra45 workstation hwmon driver.
David S. Miller [Mon, 25 Aug 2008 03:59:49 +0000 (20:59 -0700)]
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>

drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/ultra45_env.c [new file with mode: 0644]

index d402e8d..89765dd 100644 (file)
@@ -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
index 950134a..ee511ec 100644 (file)
@@ -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 (file)
index 0000000..9aec95c
--- /dev/null
@@ -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);