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hwmon: (nct6775) Add case open detection

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Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2012-12-04 03:13:34 -08:00
parent 9de2e2e84e
commit a6bd587842
1 changed files with 67 additions and 0 deletions
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67
drivers/hwmon/nct6775.c
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@ -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;