hi folks,
(trimming aggressively)
>> What is the point of generating the group at runtime?
>>
>
> Having a single file group to create and delete. I made something
> similar for the pcf8591 driver (although I didn't publish that patch
> yet.)
>
>
and further, that the number of sensors changes by chip model in some cases.
>> I changed the ordering in asb100 on purpose... it closes the small window
>> of time between when the hwmon class is registered and the device attributes
>> are populated. It's something of a race condition... sensors(1) could run
>> in the middle of that.
>>
>
> And I second that change. We should fix all drivers in a similar way,
> before we add feature detection capability to libsensors.
>
>
Cool. Observation becomes Knowledge :-D
>>> --- ../linux-2.6.18-rc3-sk/drivers/hwmon/pc87360.c 2006-06-17 19:49:35.000000000 -0600
>>> +++ sysdev/drivers/hwmon/pc87360.c 2006-08-03 12:58:29.000000000 -0600
>>> @@ -829,6 +829,83 @@ static int __init pc87360_find(int sioad
>>> return 0;
>>> }
>>>
>>> +/* Declare and use an attribute-group for simplicity.
>>> + This driver declares all attributes statically, so we count uses of
>>> + SENSOR_ATTR, DEVICE_ATTR, and add 1 space for trailing NULL (+0 fudge)
>>> +*/
>>> +#define ENOUGH_ATTRS 89 + 4 + 1 + 0
>>>
>
> My experience is that this kind of construct is likely to break as soon
> as the driver evolves :( I see you check carefully so no overflow can
> happen, good, but still...
>
>
I was never comfortable with that, hence the goofy symbol names.
>>
>> You can't fill your static array from here. What if you have two
>> pc87360s? If you're going to do it at runtime, it has to be during
>> module init. But again, why do it at runtime in the first place?
>>
>
> There will never be two PC87360s in a machine, that wouldn't make
> sense. But this raises a concern about Jim's approach: it only works
> for drivers which can handle a single chip, or at least where all chips
> are guaranteed to share the exact same configuration. I took that
> shortcut for the PCF8591 as well, but on second though it's plain
> wrong. This doesn't fit in the device driver model at all. Given that
> we want to convert all i2c-isa drivers to platform drivers at the end
> of this year, and the i2c subsystem to the driver model hopefully even
> before that, we are shooting ourselves in the feet if we go Jim's (and
> my) way.
>
> Mark's approach is magnitudes better.
>
> Jim, sorry about that, nothing personal ;) Thanks for your contribution
> anyway, I'm certain it helps Mark refine his own excellent ideas :)
>
>
Im not sure which parts bother you most, so I'll break it down as I see it.
1. static decls of ATTRs intrinsically limits driver to 1 instance, I
agree.
As you note, the chip wouldnt be used 2x on a board, so designing for that
wasnt valuable (Im guessing). I dont see the value now in re-doing the
driver
to change this, unless theres something about the migration plan ( that
has effects, requirements that I dont appreciate yet)
2. Previous patch built groups at runtime - thats now gone.
This patch version declares a separate sub-group for each sensor-type,
which allows the same runtime-choices, but now creating attr-groups,
instead of looping thru and creating single attrs.
As I see it, this copies Marks approach closely.
patch includes a code-move to bring 3 volts-related attrs and callbacks up
with the code for VIN, so theyre in-scope for the vin-attr-grp declaration.
Its had cursory testing, will test over next few days.
--------
Convert loops of device_create_file() calls, with unchecked return codes,
into declarations of attribute groups per sensor-type, and a call
to sysfs-create-group() for each.
Signed-off-by: Jim Cromie jim.cromie at gmail.com
[jimc at harpo hwmon-stuff]$ diffstat diff.sys-grp.20060815.223612
pc87360.c | 216
++++++++++++++++++++++++++++++++++++++++----------------------
1 files changed, 142 insertions(+), 74 deletions(-)
diff -ruNp -X dontdiff -X exclude-diffs ../linux-2.6.18-rc4-mm1-sk/drivers/hwmon/pc87360.c sys-grp/drivers/hwmon/pc87360.c
--- ../linux-2.6.18-rc4-mm1-sk/drivers/hwmon/pc87360.c 2006-08-14 21:19:24.000000000 -0600
+++ sys-grp/drivers/hwmon/pc87360.c 2006-08-15 22:46:16.000000000 -0600
@@ -327,6 +327,12 @@ static struct sensor_device_attribute fa
SENSOR_ATTR(fan3_min, S_IWUSR | S_IRUGO, show_fan_min, set_fan_min, 2),
};
+#define FAN_UNIT_ATTRS(X) \
+ &fan_input[X].dev_attr.attr, \
+ &fan_status[X].dev_attr.attr, \
+ &fan_div[X].dev_attr.attr, \
+ &fan_min[X].dev_attr.attr
+
static ssize_t show_pwm(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
@@ -359,6 +365,19 @@ static struct sensor_device_attribute pw
SENSOR_ATTR(pwm3, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 2),
};
+static struct attribute * pc8736x_fan_attr_array[] = {
+ FAN_UNIT_ATTRS(0),
+ FAN_UNIT_ATTRS(1),
+ FAN_UNIT_ATTRS(2),
+ &pwm[0].dev_attr.attr,
+ &pwm[1].dev_attr.attr,
+ &pwm[2].dev_attr.attr,
+ NULL
+};
+static const struct attribute_group pc8736x_fan_group = {
+ .attrs = pc8736x_fan_attr_array,
+};
+
static ssize_t show_in_input(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
@@ -471,6 +490,61 @@ static struct sensor_device_attribute in
SENSOR_ATTR(in10_max, S_IWUSR | S_IRUGO, show_in_max, set_in_max, 10),
};
+#define VIN_UNIT_ATTRS(X) \
+ &in_input[X].dev_attr.attr, \
+ &in_status[X].dev_attr.attr, \
+ &in_min[X].dev_attr.attr, \
+ &in_max[X].dev_attr.attr
+
+static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct pc87360_data *data = pc87360_update_device(dev);
+ return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
+}
+static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
+
+static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct pc87360_data *data = pc87360_update_device(dev);
+ return sprintf(buf, "%u\n", data->vrm);
+}
+static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct pc87360_data *data = i2c_get_clientdata(client);
+ data->vrm = simple_strtoul(buf, NULL, 10);
+ return count;
+}
+static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
+
+static ssize_t show_in_alarms(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct pc87360_data *data = pc87360_update_device(dev);
+ return sprintf(buf, "%u\n", data->in_alarms);
+}
+static DEVICE_ATTR(alarms_in, S_IRUGO, show_in_alarms, NULL);
+
+static struct attribute *pc8736x_vin_attr_array[] = {
+ VIN_UNIT_ATTRS(0),
+ VIN_UNIT_ATTRS(1),
+ VIN_UNIT_ATTRS(2),
+ VIN_UNIT_ATTRS(3),
+ VIN_UNIT_ATTRS(4),
+ VIN_UNIT_ATTRS(5),
+ VIN_UNIT_ATTRS(6),
+ VIN_UNIT_ATTRS(7),
+ VIN_UNIT_ATTRS(8),
+ VIN_UNIT_ATTRS(9),
+ VIN_UNIT_ATTRS(10),
+ &dev_attr_cpu0_vid.attr,
+ &dev_attr_vrm.attr,
+ &dev_attr_alarms_in.attr,
+ NULL
+};
+static const struct attribute_group pc8736x_vin_group = {
+ .attrs = pc8736x_vin_attr_array,
+};
+
static ssize_t show_therm_input(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
@@ -589,33 +663,22 @@ static struct sensor_device_attribute th
show_therm_crit, set_therm_crit, 2+11),
};
-static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct pc87360_data *data = pc87360_update_device(dev);
- return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
-}
-static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
-
-static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct pc87360_data *data = pc87360_update_device(dev);
- return sprintf(buf, "%u\n", data->vrm);
-}
-static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct pc87360_data *data = i2c_get_clientdata(client);
- data->vrm = simple_strtoul(buf, NULL, 10);
- return count;
-}
-static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
-
-static ssize_t show_in_alarms(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct pc87360_data *data = pc87360_update_device(dev);
- return sprintf(buf, "%u\n", data->in_alarms);
-}
-static DEVICE_ATTR(alarms_in, S_IRUGO, show_in_alarms, NULL);
+#define THERM_UNIT_ATTRS(X) \
+ &therm_input[X].dev_attr.attr, \
+ &therm_status[X].dev_attr.attr, \
+ &therm_min[X].dev_attr.attr, \
+ &therm_max[X].dev_attr.attr, \
+ &therm_crit[X].dev_attr.attr
+
+static struct attribute * pc8736x_therm_attr_array[] = {
+ THERM_UNIT_ATTRS(0),
+ THERM_UNIT_ATTRS(1),
+ THERM_UNIT_ATTRS(2),
+ NULL
+};
+static const struct attribute_group pc8736x_therm_group = {
+ .attrs = pc8736x_therm_attr_array,
+};
static ssize_t show_temp_input(struct device *dev, struct device_attribute *devattr, char *buf)
{
@@ -735,6 +798,25 @@ static ssize_t show_temp_alarms(struct d
}
static DEVICE_ATTR(alarms_temp, S_IRUGO, show_temp_alarms, NULL);
+#define TEMP_UNIT_ATTRS(X) \
+ &temp_input[X].dev_attr.attr, \
+ &temp_status[X].dev_attr.attr, \
+ &temp_min[X].dev_attr.attr, \
+ &temp_max[X].dev_attr.attr, \
+ &temp_crit[X].dev_attr.attr
+
+static struct attribute * pc8736x_temp_attr_array[] = {
+ TEMP_UNIT_ATTRS(0),
+ TEMP_UNIT_ATTRS(1),
+ TEMP_UNIT_ATTRS(2),
+ /* include the few miscellaneous atts here */
+ &dev_attr_alarms_temp.attr,
+ NULL
+};
+static const struct attribute_group pc8736x_temp_group = {
+ .attrs = pc8736x_temp_attr_array,
+};
+
/*
* Device detection, registration and update
*/
@@ -935,67 +1017,46 @@ static int pc87360_detect(struct i2c_ada
pc87360_init_client(client, use_thermistors);
}
- /* Register sysfs hooks */
- data->class_dev = hwmon_device_register(&client->dev);
- if (IS_ERR(data->class_dev)) {
- err = PTR_ERR(data->class_dev);
+ /* Register sysfs groups */
+
+ if (data->innr &&
+ sysfs_create_group(&client->dev.kobj,
+ &pc8736x_vin_group))
goto ERROR3;
- }
- if (data->innr) {
- for (i = 0; i < 11; i++) {
- device_create_file(dev, &in_input[i].dev_attr);
- device_create_file(dev, &in_min[i].dev_attr);
- device_create_file(dev, &in_max[i].dev_attr);
- device_create_file(dev, &in_status[i].dev_attr);
- }
- device_create_file(dev, &dev_attr_cpu0_vid);
- device_create_file(dev, &dev_attr_vrm);
- device_create_file(dev, &dev_attr_alarms_in);
- }
+ if (data->tempnr &&
+ sysfs_create_group(&client->dev.kobj,
+ &pc8736x_temp_group))
+ goto ERROR3;
- if (data->tempnr) {
- for (i = 0; i < data->tempnr; i++) {
- device_create_file(dev, &temp_input[i].dev_attr);
- device_create_file(dev, &temp_min[i].dev_attr);
- device_create_file(dev, &temp_max[i].dev_attr);
- device_create_file(dev, &temp_crit[i].dev_attr);
- device_create_file(dev, &temp_status[i].dev_attr);
- }
- device_create_file(dev, &dev_attr_alarms_temp);
- }
+ if (data->innr == 14 &&
+ sysfs_create_group(&client->dev.kobj,
+ &pc8736x_therm_group))
+ goto ERROR3;
- if (data->innr == 14) {
- for (i = 0; i < 3; i++) {
- device_create_file(dev, &therm_input[i].dev_attr);
- device_create_file(dev, &therm_min[i].dev_attr);
- device_create_file(dev, &therm_max[i].dev_attr);
- device_create_file(dev, &therm_crit[i].dev_attr);
- device_create_file(dev, &therm_status[i].dev_attr);
- }
- }
+ if (data->fannr &&
+ sysfs_create_group(&client->dev.kobj,
+ &pc8736x_fan_group))
+ goto ERROR3;
- for (i = 0; i < data->fannr; i++) {
- if (FAN_CONFIG_MONITOR(data->fan_conf, i)) {
- device_create_file(dev, &fan_input[i].dev_attr);
- device_create_file(dev, &fan_min[i].dev_attr);
- device_create_file(dev, &fan_div[i].dev_attr);
- device_create_file(dev, &fan_status[i].dev_attr);
- }
- if (FAN_CONFIG_CONTROL(data->fan_conf, i))
- device_create_file(dev, &pwm[i].dev_attr);
+ data->class_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->class_dev)) {
+ err = PTR_ERR(data->class_dev);
+ goto ERROR3;
}
-
return 0;
ERROR3:
+ sysfs_remove_group(&client->dev.kobj, &pc8736x_temp_group);
+ sysfs_remove_group(&client->dev.kobj, &pc8736x_fan_group);
+ sysfs_remove_group(&client->dev.kobj, &pc8736x_therm_group);
+ sysfs_remove_group(&client->dev.kobj, &pc8736x_vin_group);
+
i2c_detach_client(client);
ERROR2:
- for (i = 0; i < 3; i++) {
- if (data->address[i]) {
+ for (i = 0; i < 3; i++)
+ if (data->address[i])
release_region(data->address[i], PC87360_EXTENT);
- }
- }
ERROR1:
kfree(data);
return err;
@@ -1008,16 +1069,19 @@ static int pc87360_detach_client(struct
hwmon_device_unregister(data->class_dev);
+ sysfs_remove_group(&client->dev.kobj, &pc8736x_temp_group);
+ sysfs_remove_group(&client->dev.kobj, &pc8736x_fan_group);
+ sysfs_remove_group(&client->dev.kobj, &pc8736x_therm_group);
+ sysfs_remove_group(&client->dev.kobj, &pc8736x_vin_group);
+
if ((i = i2c_detach_client(client)))
return i;
- for (i = 0; i < 3; i++) {
- if (data->address[i]) {
+ for (i = 0; i < 3; i++)
+ if (data->address[i])
release_region(data->address[i], PC87360_EXTENT);
- }
- }
- kfree(data);
+ kfree(data);
return 0;
}
