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Subject[PATCH v5 02/12] hwmon: (nct6775) Add case open detection
Date
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/nct6775.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)
diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index f75cd82..435691f 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;
--
1.7.9.7


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