hwmon: (w83791d) new sysfs beep/alarm methodology

Add new sysfs alarm methodology to w83791d driver

Signed-off-by: Charles Spirakis <bezaur@gmail.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

3 files changed, 176 insertions, 44 deletions

diff --git a/Documentation/hwmon/w83791d b/Documentation/hwmon/w83791d
index db9881df88a..f153b2f6d62 100644
--- a/Documentation/hwmon/w83791d
+++ b/Documentation/hwmon/w83791d
@@ -75,46 +75,64 @@ Voltage sensors (also known as IN sensors) report their values in millivolts.
 An alarm is triggered if the voltage has crossed a programmable minimum
 or maximum limit.
 
-The bit ordering for the alarm "realtime status register" and the
-"beep enable registers" are different.
-
-in0 (VCORE)  :  alarms: 0x000001 beep_enable: 0x000001
-in1 (VINR0)  :  alarms: 0x000002 beep_enable: 0x002000 <== mismatch
-in2 (+3.3VIN):  alarms: 0x000004 beep_enable: 0x000004
-in3 (5VDD)   :  alarms: 0x000008 beep_enable: 0x000008
-in4 (+12VIN) :  alarms: 0x000100 beep_enable: 0x000100
-in5 (-12VIN) :  alarms: 0x000200 beep_enable: 0x000200
-in6 (-5VIN)  :  alarms: 0x000400 beep_enable: 0x000400
-in7 (VSB)    :  alarms: 0x080000 beep_enable: 0x010000 <== mismatch
-in8 (VBAT)   :  alarms: 0x100000 beep_enable: 0x020000 <== mismatch
-in9 (VINR1)  :  alarms: 0x004000 beep_enable: 0x004000
-temp1        :  alarms: 0x000010 beep_enable: 0x000010
-temp2        :  alarms: 0x000020 beep_enable: 0x000020
-temp3        :  alarms: 0x002000 beep_enable: 0x000002 <== mismatch
-fan1         :  alarms: 0x000040 beep_enable: 0x000040
-fan2         :  alarms: 0x000080 beep_enable: 0x000080
-fan3         :  alarms: 0x000800 beep_enable: 0x000800
-fan4         :  alarms: 0x200000 beep_enable: 0x200000
-fan5         :  alarms: 0x400000 beep_enable: 0x400000
-tart1        :  alarms: 0x010000 beep_enable: 0x040000 <== mismatch
-tart2        :  alarms: 0x020000 beep_enable: 0x080000 <== mismatch
-tart3        :  alarms: 0x040000 beep_enable: 0x100000 <== mismatch
-case_open    :  alarms: 0x001000 beep_enable: 0x001000
-user_enable  :  alarms: -------- beep_enable: 0x800000
-
-*** NOTE: It is the responsibility of user-space code to handle the fact
-that the beep enable and alarm bits are in different positions when using that
-feature of the chip.
-
-When an alarm goes off, you can be warned by a beeping signal through your
-computer speaker. It is possible to enable all beeping globally, or only
-the beeping for some alarms.
-
-The driver only reads the chip values each 3 seconds; reading them more
-often will do no harm, but will return 'old' values.
+The w83791d has a global bit used to enable beeping from the speaker when an
+alarm is triggered as well as a bitmask to enable or disable the beep for
+specific alarms. You need both the global beep enable bit and the
+corresponding beep bit to be on for a triggered alarm to sound a beep.
+
+The sysfs interface to the gloabal enable is via the sysfs beep_enable file.
+This file is used for both legacy and new code.
+
+The sysfs interface to the beep bitmask has migrated from the original legacy
+method of a single sysfs beep_mask file to a newer method using multiple
+*_beep files as described in .../Documentation/hwmon/sysfs-interface.
+
+A similar change has occured for the bitmap corresponding to the alarms. The
+original legacy method used a single sysfs alarms file containing a bitmap
+of triggered alarms. The newer method uses multiple sysfs *_alarm files
+(again following the pattern described in sysfs-interface).
+
+Since both methods read and write the underlying hardware, they can be used
+interchangeably and changes in one will automatically be reflected by
+the other. If you use the legacy bitmask method, your user-space code is
+responsible for handling the fact that the alarms and beep_mask bitmaps
+are not the same (see the table below).
+
+NOTE: All new code should be written to use the newer sysfs-interface
+specification as that avoids bitmap problems and is the preferred interface
+going forward.
+
+The driver reads the hardware chip values at most once every three seconds.
+User mode code requesting values more often will receive cached values.
+
+Alarms bitmap vs. beep_mask bitmask
+------------------------------------
+For legacy code using the alarms and beep_mask files:
+
+in0 (VCORE)  :  alarms: 0x000001 beep_mask: 0x000001
+in1 (VINR0)  :  alarms: 0x000002 beep_mask: 0x002000 <== mismatch
+in2 (+3.3VIN):  alarms: 0x000004 beep_mask: 0x000004
+in3 (5VDD)   :  alarms: 0x000008 beep_mask: 0x000008
+in4 (+12VIN) :  alarms: 0x000100 beep_mask: 0x000100
+in5 (-12VIN) :  alarms: 0x000200 beep_mask: 0x000200
+in6 (-5VIN)  :  alarms: 0x000400 beep_mask: 0x000400
+in7 (VSB)    :  alarms: 0x080000 beep_mask: 0x010000 <== mismatch
+in8 (VBAT)   :  alarms: 0x100000 beep_mask: 0x020000 <== mismatch
+in9 (VINR1)  :  alarms: 0x004000 beep_mask: 0x004000
+temp1        :  alarms: 0x000010 beep_mask: 0x000010
+temp2        :  alarms: 0x000020 beep_mask: 0x000020
+temp3        :  alarms: 0x002000 beep_mask: 0x000002 <== mismatch
+fan1         :  alarms: 0x000040 beep_mask: 0x000040
+fan2         :  alarms: 0x000080 beep_mask: 0x000080
+fan3         :  alarms: 0x000800 beep_mask: 0x000800
+fan4         :  alarms: 0x200000 beep_mask: 0x200000
+fan5         :  alarms: 0x400000 beep_mask: 0x400000
+tart1        :  alarms: 0x010000 beep_mask: 0x040000 <== mismatch
+tart2        :  alarms: 0x020000 beep_mask: 0x080000 <== mismatch
+tart3        :  alarms: 0x040000 beep_mask: 0x100000 <== mismatch
+case_open    :  alarms: 0x001000 beep_mask: 0x001000
+global_enable:  alarms: -------- beep_mask: 0x800000 (modified via beep_enable)
 
 W83791D TODO:
 ---------------
-Provide a patch for per-file alarms and beep enables as defined in the hwmon
-	documentation (Documentation/hwmon/sysfs-interface)
 Provide a patch for smart-fan control (still need appropriate motherboard/fans)
diff --git a/MAINTAINERS b/MAINTAINERS
index 9a91d9e3f1f..62931dbb4a7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4106,7 +4106,7 @@ W83791D HARDWARE MONITORING DRIVER
 P:	Charles Spirakis
 M:	bezaur@gmail.com
 L:	lm-sensors@lm-sensors.org
-S:	Maintained
+S:	Odd Fixes
 
 W83793 HARDWARE MONITORING DRIVER
 P:	Rudolf Marek
diff --git a/drivers/hwmon/w83791d.c b/drivers/hwmon/w83791d.c
index a3cb89455ea..de4eb3e7b27 100644
--- a/drivers/hwmon/w83791d.c
+++ b/drivers/hwmon/w83791d.c
@@ -2,7 +2,7 @@
     w83791d.c - Part of lm_sensors, Linux kernel modules for hardware
                 monitoring
 
-    Copyright (C) 2006 Charles Spirakis <bezaur@gmail.com>
+    Copyright (C) 2006-2007 Charles Spirakis <bezaur@gmail.com>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -384,6 +384,85 @@ static struct sensor_device_attribute sda_in_max[] = {
 	SENSOR_ATTR(in9_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 9),
 };
 
+
+static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	struct sensor_device_attribute *sensor_attr =
+						to_sensor_dev_attr(attr);
+	struct w83791d_data *data = w83791d_update_device(dev);
+	int bitnr = sensor_attr->index;
+
+	return sprintf(buf, "%d\n", (data->beep_mask >> bitnr) & 1);
+}
+
+static ssize_t store_beep(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct sensor_device_attribute *sensor_attr =
+						to_sensor_dev_attr(attr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct w83791d_data *data = i2c_get_clientdata(client);
+	int bitnr = sensor_attr->index;
+	int bytenr = bitnr / 8;
+	long val = simple_strtol(buf, NULL, 10) ? 1 : 0;
+
+	mutex_lock(&data->update_lock);
+
+	data->beep_mask &= ~(0xff << (bytenr * 8));
+	data->beep_mask |= w83791d_read(client, W83791D_REG_BEEP_CTRL[bytenr])
+		<< (bytenr * 8);
+
+	data->beep_mask &= ~(1 << bitnr);
+	data->beep_mask |= val << bitnr;
+
+	w83791d_write(client, W83791D_REG_BEEP_CTRL[bytenr],
+		(data->beep_mask >> (bytenr * 8)) & 0xff);
+
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	struct sensor_device_attribute *sensor_attr =
+						to_sensor_dev_attr(attr);
+	struct w83791d_data *data = w83791d_update_device(dev);
+	int bitnr = sensor_attr->index;
+
+	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
+}
+
+/* Note: The bitmask for the beep enable/disable is different than
+   the bitmask for the alarm. */
+static struct sensor_device_attribute sda_in_beep[] = {
+	SENSOR_ATTR(in0_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 0),
+	SENSOR_ATTR(in1_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 13),
+	SENSOR_ATTR(in2_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 2),
+	SENSOR_ATTR(in3_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 3),
+	SENSOR_ATTR(in4_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 8),
+	SENSOR_ATTR(in5_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 9),
+	SENSOR_ATTR(in6_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 10),
+	SENSOR_ATTR(in7_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 16),
+	SENSOR_ATTR(in8_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 17),
+	SENSOR_ATTR(in9_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 14),
+};
+
+static struct sensor_device_attribute sda_in_alarm[] = {
+	SENSOR_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0),
+	SENSOR_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1),
+	SENSOR_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2),
+	SENSOR_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3),
+	SENSOR_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8),
+	SENSOR_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9),
+	SENSOR_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10),
+	SENSOR_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 19),
+	SENSOR_ATTR(in8_alarm, S_IRUGO, show_alarm, NULL, 20),
+	SENSOR_ATTR(in9_alarm, S_IRUGO, show_alarm, NULL, 14),
+};
+
 #define show_fan_reg(reg) \
 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 				char *buf) \
@@ -536,6 +615,22 @@ static struct sensor_device_attribute sda_fan_div[] = {
 			show_fan_div, store_fan_div, 4),
 };
 
+static struct sensor_device_attribute sda_fan_beep[] = {
+	SENSOR_ATTR(fan1_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 6),
+	SENSOR_ATTR(fan2_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 7),
+	SENSOR_ATTR(fan3_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 11),
+	SENSOR_ATTR(fan4_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 21),
+	SENSOR_ATTR(fan5_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 22),
+};
+
+static struct sensor_device_attribute sda_fan_alarm[] = {
+	SENSOR_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6),
+	SENSOR_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7),
+	SENSOR_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11),
+	SENSOR_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 21),
+	SENSOR_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 22),
+};
+
 /* read/write the temperature1, includes measured value and limits */
 static ssize_t show_temp1(struct device *dev, struct device_attribute *devattr,
 				char *buf)
@@ -618,6 +713,19 @@ static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
 			show_temp23, store_temp23, 1, 2),
 };
 
+/* Note: The bitmask for the beep enable/disable is different than
+   the bitmask for the alarm. */
+static struct sensor_device_attribute sda_temp_beep[] = {
+	SENSOR_ATTR(temp1_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 4),
+	SENSOR_ATTR(temp2_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 5),
+	SENSOR_ATTR(temp3_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 1),
+};
+
+static struct sensor_device_attribute sda_temp_alarm[] = {
+	SENSOR_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4),
+	SENSOR_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5),
+	SENSOR_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 13),
+};
 
 /* get reatime status of all sensors items: voltage, temp, fan */
 static ssize_t show_alarms_reg(struct device *dev,
@@ -749,17 +857,23 @@ static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
 #define IN_UNIT_ATTRS(X) \
 	&sda_in_input[X].dev_attr.attr, \
 	&sda_in_min[X].dev_attr.attr,   \
-	&sda_in_max[X].dev_attr.attr
+	&sda_in_max[X].dev_attr.attr,   \
+	&sda_in_beep[X].dev_attr.attr,  \
+	&sda_in_alarm[X].dev_attr.attr
 
 #define FAN_UNIT_ATTRS(X) \
 	&sda_fan_input[X].dev_attr.attr,        \
 	&sda_fan_min[X].dev_attr.attr,          \
-	&sda_fan_div[X].dev_attr.attr
+	&sda_fan_div[X].dev_attr.attr,          \
+	&sda_fan_beep[X].dev_attr.attr,         \
+	&sda_fan_alarm[X].dev_attr.attr
 
 #define TEMP_UNIT_ATTRS(X) \
 	&sda_temp_input[X].dev_attr.attr,       \
 	&sda_temp_max[X].dev_attr.attr,         \
-	&sda_temp_max_hyst[X].dev_attr.attr
+	&sda_temp_max_hyst[X].dev_attr.attr,    \
+	&sda_temp_beep[X].dev_attr.attr,        \
+	&sda_temp_alarm[X].dev_attr.attr
 
 static struct attribute *w83791d_attributes[] = {
 	IN_UNIT_ATTRS(0),