From a6bd587842772cd3e63a689c7ff4d64cf25284a3 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Tue, 4 Dec 2012 03:13:34 -0800 Subject: hwmon: (nct6775) Add case open detection Signed-off-by: Guenter Roeck --- drivers/hwmon/nct6775.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) (limited to 'drivers') diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c index f75cd823153..435691febe9 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; -- cgit v1.2.3-70-g09d2