hwmon: (w83627ehf) add caseopen detection

Export caseopen alarm status into userspace for Winbond W83627*
and Nuvoton NCT677[56] chips and implement alarm clear attribute.
Second caseopen alarm on NCT6776 is also supported.

Signed-off-by: Dmitry Artamonow <mad_soft@inbox.ru>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index 36d7f270b14d..e1736b80b6b0 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -197,6 +197,9 @@ static const u16 W83627EHF_REG_TEMP_CONFIG[] = { 0, 0x152, 0x252, 0 };
 #define W83627EHF_REG_ALARM2            0x45A
 #define W83627EHF_REG_ALARM3            0x45B
 
+#define W83627EHF_REG_CASEOPEN_DET      0x42 /* SMI STATUS #2 */
+#define W83627EHF_REG_CASEOPEN_CLR      0x46 /* SMI MASK #3 */
+
 /* SmartFan registers */
 #define W83627EHF_REG_FAN_STEPUP_TIME 0x0f
 #define W83627EHF_REG_FAN_STEPDOWN_TIME 0x0e
@@ -469,6 +472,7 @@ struct w83627ehf_data {
         s16 temp_max[9];
         s16 temp_max_hyst[9];
         u32 alarms;
+        u8 caseopen;
 
         u8 pwm_mode[4]; /* 0->DC variable voltage, 1->PWM variable duty cycle */
         u8 pwm_enable[4]; /* 1->manual
@@ -874,6 +878,9 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
                                (w83627ehf_read_value(data,
                                         W83627EHF_REG_ALARM3) << 16);
 
+                data->caseopen = w83627ehf_read_value(data,
+                                                W83627EHF_REG_CASEOPEN_DET);
+
                 data->last_updated = jiffies;
                 data->valid = 1;
         }
@@ -1655,6 +1662,48 @@ show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 }
 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 
+
+/* Case open detection */
+
+static ssize_t
+show_caseopen(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct w83627ehf_data *data = w83627ehf_update_device(dev);
+
+        return sprintf(buf, "%d\n",
+                !!(data->caseopen & to_sensor_dev_attr_2(attr)->index));
+}
+
+static ssize_t
+clear_caseopen(struct device *dev, struct device_attribute *attr,
+                        const char *buf, size_t count)
+{
+        struct w83627ehf_data *data = dev_get_drvdata(dev);
+        unsigned long val;
+        u16 reg, mask;
+
+        if (strict_strtoul(buf, 10, &val) || val != 0)
+                return -EINVAL;
+
+        mask = to_sensor_dev_attr_2(attr)->nr;
+
+        mutex_lock(&data->update_lock);
+        reg = w83627ehf_read_value(data, W83627EHF_REG_CASEOPEN_CLR);
+        w83627ehf_write_value(data, W83627EHF_REG_CASEOPEN_CLR, reg | mask);
+        w83627ehf_write_value(data, W83627EHF_REG_CASEOPEN_CLR, reg & ~mask);
+        data->valid = 0;        /* Force cache refresh */
+        mutex_unlock(&data->update_lock);
+
+        return count;
+}
+
+static struct sensor_device_attribute_2 sda_caseopen[] = {
+        SENSOR_ATTR_2(intrusion0_alarm, S_IWUSR | S_IRUGO, show_caseopen,
+                        clear_caseopen, 0x80, 0x10),
+        SENSOR_ATTR_2(intrusion1_alarm, S_IWUSR | S_IRUGO, show_caseopen,
+                        clear_caseopen, 0x40, 0x40),
+};
+
 /*
  * Driver and device management
  */
@@ -1711,6 +1760,9 @@ static void w83627ehf_device_remove_files(struct device *dev)
                 device_remove_file(dev, &sda_temp_type[i].dev_attr);
         }
 
+        device_remove_file(dev, &sda_caseopen[0].dev_attr);
+        device_remove_file(dev, &sda_caseopen[1].dev_attr);
+
         device_remove_file(dev, &dev_attr_name);
         device_remove_file(dev, &dev_attr_cpu0_vid);
 }
@@ -2269,6 +2321,16 @@ static int __devinit w83627ehf_probe(struct platform_device *pdev)
                         goto exit_remove;
         }
 
+        err = device_create_file(dev, &sda_caseopen[0].dev_attr);
+        if (err)
+                goto exit_remove;
+
+        if (sio_data->kind == nct6776) {
+                err = device_create_file(dev, &sda_caseopen[1].dev_attr);
+                if (err)
+                        goto exit_remove;
+        }
+
         err = device_create_file(dev, &dev_attr_name);
         if (err)
                 goto exit_remove;