Commit d1bf8cf6 authored by Ken Milmore's avatar Ken Milmore Committed by Jean Delvare
Browse files

hwmon: (asc7621) Bug fixes 



* Allow fan minimum RPM to be set to zero without triggering alarms.
* Fix voltage scaling arithmetic and correct scale factors.
* Correct fan1-fan4 alarm bit shifts.
* Correct register address for temp3_smoothing_enable.
* Read the alarm registers with high priority.

Signed-off-by: default avatarKen Milmore <ken.milmore@googlemail.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 94b849aa

drivers/hwmon/asc7621.c

+31 −32
Original line number Diff line number Diff line
@@ -268,8 +268,11 @@ static ssize_t store_fan16(struct device *dev, 
	if (strict_strtol(buf, 10, &reqval))

		return -EINVAL;



	/* If a minimum RPM of zero is requested, then we set the register to

	   0xffff. This value allows the fan to be stopped completely without

	   generating an alarm. */

	reqval =

	    (SENSORS_LIMIT((reqval) <= 0 ? 0 : 5400000 / (reqval), 0, 65534));

	    (reqval <= 0 ? 0xffff : SENSORS_LIMIT(5400000 / reqval, 0, 0xfffe));



	mutex_lock(&data->update_lock);

	data->reg[param->msb[0]] = (reqval >> 8) & 0xff;
@@ -285,8 +288,9 @@ static ssize_t store_fan16(struct device *dev, 
 * Voltages are scaled in the device so that the nominal voltage

 * is 3/4ths of the 0-255 range (i.e. 192).

 * If all voltages are 'normal' then all voltage registers will

 * read 0xC0.  This doesn't help us if we don't have a point of refernce.

 * The data sheet however provides us with the full scale value for each

 * read 0xC0.

 *

 * The data sheet provides us with the 3/4 scale value for each voltage

 * which is stored in in_scaling.  The sda->index parameter value provides

 * the index into in_scaling.

 *
@@ -295,7 +299,7 @@ static ssize_t store_fan16(struct device *dev, 
 */



static int asc7621_in_scaling[] = {

	3320, 3000, 4380, 6640, 16000

	2500, 2250, 3300, 5000, 12000

};



static ssize_t show_in10(struct device *dev, struct device_attribute *attr,
@@ -306,19 +310,12 @@ static ssize_t show_in10(struct device *dev, struct device_attribute *attr, 
	u8 nr = sda->index;



	mutex_lock(&data->update_lock);

	regval = (data->reg[param->msb[0]] * asc7621_in_scaling[nr]) / 256;



	/* The LSB value is a 2-bit scaling of the MSB's LSbit value.

	 * I.E.  If the maximim voltage for this input is 6640 millivolts then

	 * a MSB register value of 0 = 0mv and 255 = 6640mv.

	 * A 1 step change therefore represents 25.9mv (6640 / 256).

	 * The extra 2-bits therefore represent increments of 6.48mv.

	 */

	regval += ((asc7621_in_scaling[nr] / 256) / 4) *

	    (data->reg[param->lsb[0]] >> 6);



	regval = (data->reg[param->msb[0]] << 8) | (data->reg[param->lsb[0]]);

	mutex_unlock(&data->update_lock);



	/* The LSB value is a 2-bit scaling of the MSB's LSbit value. */

	regval = (regval >> 6) * asc7621_in_scaling[nr] / (0xc0 << 2);



	return sprintf(buf, "%u\n", regval);

}
@@ -331,7 +328,7 @@ static ssize_t show_in8(struct device *dev, struct device_attribute *attr, 


	return sprintf(buf, "%u\n",

		       ((data->reg[param->msb[0]] *

			 asc7621_in_scaling[nr]) / 256));

			 asc7621_in_scaling[nr]) / 0xc0));

}



static ssize_t store_in8(struct device *dev, struct device_attribute *attr,
@@ -344,9 +341,11 @@ static ssize_t store_in8(struct device *dev, struct device_attribute *attr, 
	if (strict_strtol(buf, 10, &reqval))

		return -EINVAL;



	reqval = SENSORS_LIMIT(reqval, 0, asc7621_in_scaling[nr]);

	reqval = SENSORS_LIMIT(reqval, 0, 0xffff);



	reqval = reqval * 0xc0 / asc7621_in_scaling[nr];



	reqval = (reqval * 255 + 128) / asc7621_in_scaling[nr];

	reqval = SENSORS_LIMIT(reqval, 0, 0xff);



	mutex_lock(&data->update_lock);

	data->reg[param->msb[0]] = reqval;
@@ -846,11 +845,11 @@ static struct asc7621_param asc7621_params[] = { 
	PWRITE(in3_max, 3, PRI_LOW, 0x4b, 0, 0, 0, in8),

	PWRITE(in4_max, 4, PRI_LOW, 0x4d, 0, 0, 0, in8),



	PREAD(in0_alarm, 0, PRI_LOW, 0x41, 0, 0x01, 0, bitmask),

	PREAD(in1_alarm, 1, PRI_LOW, 0x41, 0, 0x01, 1, bitmask),

	PREAD(in2_alarm, 2, PRI_LOW, 0x41, 0, 0x01, 2, bitmask),

	PREAD(in3_alarm, 3, PRI_LOW, 0x41, 0, 0x01, 3, bitmask),

	PREAD(in4_alarm, 4, PRI_LOW, 0x42, 0, 0x01, 0, bitmask),

	PREAD(in0_alarm, 0, PRI_HIGH, 0x41, 0, 0x01, 0, bitmask),

	PREAD(in1_alarm, 1, PRI_HIGH, 0x41, 0, 0x01, 1, bitmask),

	PREAD(in2_alarm, 2, PRI_HIGH, 0x41, 0, 0x01, 2, bitmask),

	PREAD(in3_alarm, 3, PRI_HIGH, 0x41, 0, 0x01, 3, bitmask),

	PREAD(in4_alarm, 4, PRI_HIGH, 0x42, 0, 0x01, 0, bitmask),



	PREAD(fan1_input, 0, PRI_HIGH, 0x29, 0x28, 0, 0, fan16),

	PREAD(fan2_input, 1, PRI_HIGH, 0x2b, 0x2a, 0, 0, fan16),
@@ -862,10 +861,10 @@ static struct asc7621_param asc7621_params[] = { 
	PWRITE(fan3_min, 2, PRI_LOW, 0x59, 0x58, 0, 0, fan16),

	PWRITE(fan4_min, 3, PRI_LOW, 0x5b, 0x5a, 0, 0, fan16),



	PREAD(fan1_alarm, 0, PRI_LOW, 0x42, 0, 0x01, 0, bitmask),

	PREAD(fan2_alarm, 1, PRI_LOW, 0x42, 0, 0x01, 1, bitmask),

	PREAD(fan3_alarm, 2, PRI_LOW, 0x42, 0, 0x01, 2, bitmask),

	PREAD(fan4_alarm, 3, PRI_LOW, 0x42, 0, 0x01, 3, bitmask),

	PREAD(fan1_alarm, 0, PRI_HIGH, 0x42, 0, 0x01, 2, bitmask),

	PREAD(fan2_alarm, 1, PRI_HIGH, 0x42, 0, 0x01, 3, bitmask),

	PREAD(fan3_alarm, 2, PRI_HIGH, 0x42, 0, 0x01, 4, bitmask),

	PREAD(fan4_alarm, 3, PRI_HIGH, 0x42, 0, 0x01, 5, bitmask),



	PREAD(temp1_input, 0, PRI_HIGH, 0x25, 0x10, 0, 0, temp10),

	PREAD(temp2_input, 1, PRI_HIGH, 0x26, 0x15, 0, 0, temp10),
@@ -886,10 +885,10 @@ static struct asc7621_param asc7621_params[] = { 
	PWRITE(temp3_max, 2, PRI_LOW, 0x53, 0, 0, 0, temp8),

	PWRITE(temp4_max, 3, PRI_LOW, 0x35, 0, 0, 0, temp8),



	PREAD(temp1_alarm, 0, PRI_LOW, 0x41, 0, 0x01, 4, bitmask),

	PREAD(temp2_alarm, 1, PRI_LOW, 0x41, 0, 0x01, 5, bitmask),

	PREAD(temp3_alarm, 2, PRI_LOW, 0x41, 0, 0x01, 6, bitmask),

	PREAD(temp4_alarm, 3, PRI_LOW, 0x43, 0, 0x01, 0, bitmask),

	PREAD(temp1_alarm, 0, PRI_HIGH, 0x41, 0, 0x01, 4, bitmask),

	PREAD(temp2_alarm, 1, PRI_HIGH, 0x41, 0, 0x01, 5, bitmask),

	PREAD(temp3_alarm, 2, PRI_HIGH, 0x41, 0, 0x01, 6, bitmask),

	PREAD(temp4_alarm, 3, PRI_HIGH, 0x43, 0, 0x01, 0, bitmask),



	PWRITE(temp1_source, 0, PRI_LOW, 0x02, 0, 0x07, 4, bitmask),

	PWRITE(temp2_source, 1, PRI_LOW, 0x02, 0, 0x07, 0, bitmask),
@@ -898,7 +897,7 @@ static struct asc7621_param asc7621_params[] = { 


	PWRITE(temp1_smoothing_enable, 0, PRI_LOW, 0x62, 0, 0x01, 3, bitmask),

	PWRITE(temp2_smoothing_enable, 1, PRI_LOW, 0x63, 0, 0x01, 7, bitmask),

	PWRITE(temp3_smoothing_enable, 2, PRI_LOW, 0x64, 0, 0x01, 3, bitmask),

	PWRITE(temp3_smoothing_enable, 2, PRI_LOW, 0x63, 0, 0x01, 3, bitmask),

	PWRITE(temp4_smoothing_enable, 3, PRI_LOW, 0x3c, 0, 0x01, 3, bitmask),



	PWRITE(temp1_smoothing_time, 0, PRI_LOW, 0x62, 0, 0x07, 0, temp_st),

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