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>

1 files changed, 320 insertions, 0 deletions

diff --git a/drivers/hwmon/ultra45_env.c b/drivers/hwmon/ultra45_env.c
new file mode 100644
index 000000000000..9aec95cbf7e9
--- /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);