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hwmon: (lm63) Add support for writing the external critical temperature

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On LM64, the external critical temperature limit is always writable. On LM96163,
it is writable if the chip is configured for it. Add conditional support for
writing the register dependent on chip type and configuration.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Guenter Roeck 2012-01-16 22:51:46 +01:00 committed by Jean Delvare
parent e872c91e72
commit 94e55df48a
1 changed files with 44 additions and 11 deletions
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55
drivers/hwmon/lm63.c
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@ -117,6 +117,9 @@ static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };
(val) >= 127000 ? 127 : \
(val) < 0 ? ((val) - 500) / 1000 : \
((val) + 500) / 1000)
#define TEMP8U_TO_REG(val) ((val) <= 0 ? 0 : \
(val) >= 255000 ? 255 : \
((val) + 500) / 1000)
#define TEMP11_FROM_REG(reg) ((reg) / 32 * 125)
#define TEMP11_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
(val) >= 127875 ? 0x7FE0 : \
@ -313,22 +316,33 @@ static ssize_t show_remote_temp8(struct device *dev,
+ data->temp2_offset);
}
static ssize_t set_local_temp8(struct device *dev,
struct device_attribute *dummy,
const char *buf, size_t count)
static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
int nr = attr->index;
int reg = nr == 2 ? LM63_REG_REMOTE_TCRIT : LM63_REG_LOCAL_HIGH;
long val;
int err;
int temp;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->temp8[1] = TEMP8_TO_REG(val);
i2c_smbus_write_byte_data(client, LM63_REG_LOCAL_HIGH, data->temp8[1]);
if (nr == 2) {
if (data->remote_unsigned)
temp = TEMP8U_TO_REG(val - data->temp2_offset);
else
temp = TEMP8_TO_REG(val - data->temp2_offset);
} else {
temp = TEMP8_TO_REG(val);
}
data->temp8[nr] = temp;
i2c_smbus_write_byte_data(client, reg, temp);
mutex_unlock(&data->update_lock);
return count;
}
@ -461,7 +475,7 @@ static DEVICE_ATTR(pwm1_enable, S_IRUGO, show_pwm1_enable, NULL);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_local_temp8, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_local_temp8,
set_local_temp8, 1);
set_temp8, 1);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
@ -470,12 +484,8 @@ static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 2);
static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 3);
/*
* On LM63, temp2_crit can be set only once, which should be job
* of the bootloader.
*/
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_remote_temp8,
NULL, 2);
set_temp8, 2);
static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
set_temp2_crit_hyst);
@ -510,7 +520,30 @@ static struct attribute *lm63_attributes[] = {
NULL
};
/*
* On LM63, temp2_crit can be set only once, which should be job
* of the bootloader.
* On LM64, temp2_crit can always be set.
* On LM96163, temp2_crit can be set if bit 1 of the configuration
* register is true.
*/
static umode_t lm63_attribute_mode(struct kobject *kobj,
struct attribute *attr, int index)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
if (attr == &sensor_dev_attr_temp2_crit.dev_attr.attr
&& (data->kind == lm64 ||
(data->kind == lm96163 && (data->config & 0x02))))
return attr->mode | S_IWUSR;
return attr->mode;
}
static const struct attribute_group lm63_group = {
.is_visible = lm63_attribute_mode,
.attrs = lm63_attributes,
};