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Date: Thu, 11 Aug 2011 10:46:54 -0700
From: Guenter Roeck <guenter.roeck@...csson.com>
To: Dmitry Artamonow <mad_soft@...ox.ru>
CC: "lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
Ian Dobson <i.dobson@...net-ian.com>,
Jean Delvare <khali@...ux-fr.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] hwmon: add caseopen detection to w83627ehf driver
On Wed, 2011-08-10 at 16:56 -0400, Dmitry Artamonow wrote:
> Export caseopen alarm status into userspace for Winbond W83627*
> and Nuvoton NCT677[56] chips and implement alarm clear knob.
> Second caseopen alarm on NCT6776 is also supported.
>
> Signed-off-by: Dmitry Artamonow <mad_soft@...ox.ru>
Hi Dmitry,
please consider the changes suggested below.
Thanks,
Guenter
> ---
> drivers/hwmon/w83627ehf.c | 80 +++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 80 insertions(+), 0 deletions(-)
>
> Changes from v1:
> * support for Nuvoton NCT677[56] is added (including second caseopen on NCT6776)
> * now data->caseopen contains raw register value, extraction of needed bits
> is done in show_caseopen()
> * store_caseopen_clear() is renamed to clear_caseopen()
>
> diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
> index f2b377c..6964b15 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
> @@ -468,6 +471,7 @@ 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
> @@ -873,6 +877,9 @@ 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;
> }
> @@ -1654,6 +1661,66 @@ 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);
> + struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
> + int nr = sensor_attr->index;
> + switch (nr) {
> + case 0:
> + return sprintf(buf, "%d\n", (data->caseopen >> 4) & 0x1);
> + case 1:
> + return sprintf(buf, "%d\n", (data->caseopen >> 6) & 0x1);
> + default:
> + return -ENXIO;
> + }
struct w83627ehf_data *data = w83627ehf_update_device(dev);
return sprintf(buf, "%d",
!!(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);
> + struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
> + int nr = sensor_attr->index;
> + unsigned long val;
> + unsigned int reg, mask = 0;
Initializing mask is unnecessary, and sensor_attr / nr variables are not
really necessary - see below.
> +
> + if (strict_strtoul(buf, 10, &val) || val != 0)
> + return -EINVAL;
> +
> + switch (nr) {
> + case 0:
> + mask = 0x80;
> + break;
> + case 1:
> + mask = 0x40;
> + break;
> + default:
> + return -ENXIO;
> + }
> +
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 sda_caseopen[] = {
> + SENSOR_ATTR(intrusion0_alarm, S_IWUSR | S_IRUGO, show_caseopen,
> + clear_caseopen, 0),
> + SENSOR_ATTR(intrusion1_alarm, S_IWUSR | S_IRUGO, show_caseopen,
> + clear_caseopen, 1),
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
> */
> @@ -1710,6 +1777,9 @@ 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);
> }
> @@ -2261,6 +2331,16 @@ 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;
--
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