hwmon: (nct6775) Add case open detection

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index f75cd8231534..435691febe9b 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -76,6 +76,7 @@ MODULE_PARM_DESC(force_id, "Override the detected device ID");
  * Super-I/O constants and functions
  */
 
+#define NCT6775_LD_ACPI         0x0a
 #define NCT6775_LD_HWM          0x0b
 #define NCT6775_LD_VID          0x0d
 
@@ -186,6 +187,11 @@ static const s8 NCT6775_ALARM_BITS[] = {
         4, 5, 13, -1, -1, -1,           /* temp1..temp6 */
         12, -1 };                       /* intrusion0, intrusion1 */
 
+#define INTRUSION_ALARM_BASE    30
+
+static const u8 NCT6775_REG_CR_CASEOPEN_CLR[] = { 0xe6, 0xee };
+static const u8 NCT6775_CR_CASEOPEN_CLR_MASK[] = { 0x20, 0x01 };
+
 /* NCT6776 specific data */
 
 static const s8 NCT6776_ALARM_BITS[] = {
@@ -694,6 +700,56 @@ 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
+clear_caseopen(struct device *dev, struct device_attribute *attr,
+               const char *buf, size_t count)
+{
+        struct nct6775_data *data = dev_get_drvdata(dev);
+        struct nct6775_sio_data *sio_data = dev->platform_data;
+        int nr = to_sensor_dev_attr(attr)->index - INTRUSION_ALARM_BASE;
+        unsigned long val;
+        u8 reg;
+        int ret;
+
+        if (kstrtoul(buf, 10, &val) || val != 0)
+                return -EINVAL;
+
+        mutex_lock(&data->update_lock);
+
+        /*
+         * Use CR registers to clear caseopen status.
+         * The CR registers are the same for all chips, and not all chips
+         * support clearing the caseopen status through "regular" registers.
+         */
+        ret = superio_enter(sio_data->sioreg);
+        if (ret) {
+                count = ret;
+                goto error;
+        }
+
+        superio_select(sio_data->sioreg, NCT6775_LD_ACPI);
+        reg = superio_inb(sio_data->sioreg, NCT6775_REG_CR_CASEOPEN_CLR[nr]);
+        reg |= NCT6775_CR_CASEOPEN_CLR_MASK[nr];
+        superio_outb(sio_data->sioreg, NCT6775_REG_CR_CASEOPEN_CLR[nr], reg);
+        reg &= ~NCT6775_CR_CASEOPEN_CLR_MASK[nr];
+        superio_outb(sio_data->sioreg, NCT6775_REG_CR_CASEOPEN_CLR[nr], reg);
+        superio_exit(sio_data->sioreg);
+
+        data->valid = false;    /* Force cache refresh */
+error:
+        mutex_unlock(&data->update_lock);
+        return count;
+}
+
+static struct sensor_device_attribute sda_caseopen[] = {
+        SENSOR_ATTR(intrusion0_alarm, S_IWUSR | S_IRUGO, show_alarm,
+                    clear_caseopen, INTRUSION_ALARM_BASE),
+        SENSOR_ATTR(intrusion1_alarm, S_IWUSR | S_IRUGO, show_alarm,
+                    clear_caseopen, INTRUSION_ALARM_BASE + 1),
+};
+
 /*
  * Driver and device management
  */
@@ -710,6 +766,9 @@ static void nct6775_device_remove_files(struct device *dev)
         for (i = 0; i < data->in_num; i++)
                 sysfs_remove_group(&dev->kobj, &nct6775_group_in[i]);
 
+        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);
 }
@@ -828,6 +887,14 @@ static int nct6775_probe(struct platform_device *pdev)
                         goto exit_remove;
         }
 
+        for (i = 0; i < ARRAY_SIZE(sda_caseopen); i++) {
+                if (data->ALARM_BITS[INTRUSION_ALARM_BASE + i] < 0)
+                        continue;
+                err = device_create_file(dev, &sda_caseopen[i].dev_attr);
+                if (err)
+                        goto exit_remove;
+        }
+
         err = device_create_file(dev, &dev_attr_name);
         if (err)
                 goto exit_remove;