On 一, 2012-04-09 at 14:48 +0530, Durgadoss R wrote:
> Some of the thermal drivers using the Generic Thermal Framework
> require (all/some) trip points to be writeable. This patch makes
> the trip point temperatures writeable on a per-trip point basis,
> and modifies the required function call in thermal.c. This patch
> also updates the Documentation to reflect the new change.
>
> Signed-off-by: Durgadoss R <durgadoss.r@xxxxxxxxx>
Acked-by: Zhang Rui <rui.zhang@xxxxxxxxx>
> ---
> v1
> * patch1/2: Code for making trip points writeable
> * patch2/2: Change the callee in thermal.c
> v2
> * Make both the changes in a single patch
> * Update Documentation/thermal/sysfs-api.txt
> v3
> * Re-submitting, on top of the latest mainline kernel
> v4
> * Added a check on the 'flag' parameter in tzd register function
> ---
> Documentation/thermal/sysfs-api.txt | 4 +-
> drivers/acpi/thermal.c | 4 +-
> drivers/thermal/thermal_sys.c | 115 +++++++++++++++++++++++-----------
> include/linux/thermal.h | 10 ++-
> 4 files changed, 90 insertions(+), 43 deletions(-)
>
> diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
> index 1733ab9..0c7c423 100644
> --- a/Documentation/thermal/sysfs-api.txt
> +++ b/Documentation/thermal/sysfs-api.txt
> @@ -32,7 +32,8 @@ temperature) and throttle appropriate devices.
>
> 1.1 thermal zone device interface
> 1.1.1 struct thermal_zone_device *thermal_zone_device_register(char *name,
> - int trips, void *devdata, struct thermal_zone_device_ops *ops)
> + int trips, int flag, void *devdata,
> + struct thermal_zone_device_ops *ops)
>
> This interface function adds a new thermal zone device (sensor) to
> /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
> @@ -40,6 +41,7 @@ temperature) and throttle appropriate devices.
>
> name: the thermal zone name.
> trips: the total number of trip points this thermal zone supports.
> + flag: Bit string: If 'n'th bit is set, then trip point 'n' is writeable.
> devdata: device private data
> ops: thermal zone device call-backs.
> .bind: bind the thermal zone device with a thermal cooling device.
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index 7dbebea..2107d1b 100644
> --- a/drivers/acpi/thermal.c
> +++ b/drivers/acpi/thermal.c
> @@ -845,7 +845,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
>
> if (tz->trips.passive.flags.valid)
> tz->thermal_zone =
> - thermal_zone_device_register("acpitz", trips, tz,
> + thermal_zone_device_register("acpitz", trips, 0, tz,
> &acpi_thermal_zone_ops,
> tz->trips.passive.tc1,
> tz->trips.passive.tc2,
> @@ -853,7 +853,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
> tz->polling_frequency*100);
> else
> tz->thermal_zone =
> - thermal_zone_device_register("acpitz", trips, tz,
> + thermal_zone_device_register("acpitz", trips, 0, tz,
> &acpi_thermal_zone_ops,
> 0, 0, 0,
> tz->polling_frequency*100);
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index 022bacb..35b2e4d 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -196,6 +196,28 @@ trip_point_type_show(struct device *dev, struct device_attribute *attr,
> }
>
> static ssize_t
> +trip_point_temp_store(struct device *dev, struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct thermal_zone_device *tz = to_thermal_zone(dev);
> + int trip, ret;
> + unsigned long temperature;
> +
> + if (!tz->ops->set_trip_temp)
> + return -EPERM;
> +
> + if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
> + return -EINVAL;
> +
> + if (kstrtoul(buf, 10, &temperature))
> + return -EINVAL;
> +
> + ret = tz->ops->set_trip_temp(tz, trip, temperature);
> +
> + return ret ? ret : count;
> +}
> +
> +static ssize_t
> trip_point_temp_show(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> @@ -283,33 +305,6 @@ static DEVICE_ATTR(temp, 0444, temp_show, NULL);
> static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
> static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
>
> -static struct device_attribute trip_point_attrs[] = {
> - __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
> - __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
> - __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
> -};
> -
> /* sys I/F for cooling device */
> #define to_cooling_device(_dev) \
> container_of(_dev, struct thermal_cooling_device, device)
> @@ -1089,9 +1084,54 @@ leave:
> EXPORT_SYMBOL(thermal_zone_device_update);
>
> /**
> + * create_trip_type_attr - creates a trip point type attribute
> + * @tz: the thermal zone device
> + * @indx: index into the trip_type_attrs array
> + */
> +static int create_trip_type_attr(struct thermal_zone_device *tz, int indx)
> +{
> + char attr_name[THERMAL_NAME_LENGTH];
> +
> + snprintf(attr_name, THERMAL_NAME_LENGTH, "trip_point_%d_type", indx);
> +
> + sysfs_attr_init(&tz->trip_type_attrs[indx].attr);
> + tz->trip_type_attrs[indx].attr.name = attr_name;
> + tz->trip_type_attrs[indx].attr.mode = S_IRUGO;
> + tz->trip_type_attrs[indx].show = trip_point_type_show;
> +
> + return device_create_file(&tz->device, &tz->trip_type_attrs[indx]);
> +}
> +
> +/**
> + * create_trip_temp_attr - creates a trip point temp attribute
> + * @tz: the thermal zone device
> + * @indx: index into the trip_type_attrs array
> + * @writeable: A flag: If 1, 'this' trip point is writeable; otherwise not
> + */
> +static int create_trip_temp_attr(struct thermal_zone_device *tz,
> + int indx, int writeable)
> +{
> + char attr_name[THERMAL_NAME_LENGTH];
> +
> + snprintf(attr_name, THERMAL_NAME_LENGTH, "trip_point_%d_temp", indx);
> +
> + sysfs_attr_init(&tz->trip_temp_attrs[indx].attr);
> + tz->trip_temp_attrs[indx].attr.name = attr_name;
> + tz->trip_temp_attrs[indx].attr.mode = S_IRUGO;
> + tz->trip_temp_attrs[indx].show = trip_point_temp_show;
> + if (writeable) {
> + tz->trip_temp_attrs[indx].attr.mode |= S_IWUSR;
> + tz->trip_temp_attrs[indx].store = trip_point_temp_store;
> + }
> +
> + return device_create_file(&tz->device, &tz->trip_temp_attrs[indx]);
> +}
> +
> +/**
> * thermal_zone_device_register - register a new thermal zone device
> * @type: the thermal zone device type
> * @trips: the number of trip points the thermal zone support
> + * @flag: a bit string indicating the writeablility of trip points
> * @devdata: private device data
> * @ops: standard thermal zone device callbacks
> * @tc1: thermal coefficient 1 for passive calculations
> @@ -1107,7 +1147,7 @@ EXPORT_SYMBOL(thermal_zone_device_update);
> * section 11.1.5.1 of the ACPI specification 3.0.
> */
> struct thermal_zone_device *thermal_zone_device_register(char *type,
> - int trips, void *devdata,
> + int trips, int flag, void *devdata,
> const struct thermal_zone_device_ops *ops,
> int tc1, int tc2, int passive_delay, int polling_delay)
> {
> @@ -1124,6 +1164,9 @@ struct thermal_zone_device *thermal_zone_device_register(char *type,
> if (trips > THERMAL_MAX_TRIPS || trips < 0)
> return ERR_PTR(-EINVAL);
>
> + if (flag >> trips)
> + return ERR_PTR(-EINVAL);
> +
> if (!ops || !ops->get_temp)
> return ERR_PTR(-EINVAL);
>
> @@ -1176,14 +1219,14 @@ struct thermal_zone_device *thermal_zone_device_register(char *type,
> }
>
> for (count = 0; count < trips; count++) {
> - result = device_create_file(&tz->device,
> - &trip_point_attrs[count * 2]);
> + result = create_trip_type_attr(tz, count);
> if (result)
> - break;
> - result = device_create_file(&tz->device,
> - &trip_point_attrs[count * 2 + 1]);
> + goto unregister;
> + result = create_trip_temp_attr(tz, count,
> + !!(flag & (1 << count)));
> if (result)
> goto unregister;
> +
> tz->ops->get_trip_type(tz, count, &trip_type);
> if (trip_type == THERMAL_TRIP_PASSIVE)
> passive = 1;
> @@ -1261,10 +1304,8 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
> device_remove_file(&tz->device, &dev_attr_mode);
>
> for (count = 0; count < tz->trips; count++) {
> - device_remove_file(&tz->device,
> - &trip_point_attrs[count * 2]);
> - device_remove_file(&tz->device,
> - &trip_point_attrs[count * 2 + 1]);
> + device_remove_file(&tz->device, &tz->trip_type_attrs[count]);
> + device_remove_file(&tz->device, &tz->trip_temp_attrs[count]);
> }
> thermal_remove_hwmon_sysfs(tz);
> release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 796f1ff..825d4b0 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -58,6 +58,8 @@ struct thermal_zone_device_ops {
> enum thermal_trip_type *);
> int (*get_trip_temp) (struct thermal_zone_device *, int,
> unsigned long *);
> + int (*set_trip_temp) (struct thermal_zone_device *, int,
> + unsigned long);
> int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
> int (*notify) (struct thermal_zone_device *, int,
> enum thermal_trip_type);
> @@ -89,6 +91,8 @@ struct thermal_zone_device {
> int id;
> char type[THERMAL_NAME_LENGTH];
> struct device device;
> + struct device_attribute trip_temp_attrs[THERMAL_MAX_TRIPS];
> + struct device_attribute trip_type_attrs[THERMAL_MAX_TRIPS];
> void *devdata;
> int trips;
> int tc1;
> @@ -137,9 +141,9 @@ enum {
> };
> #define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
>
> -struct thermal_zone_device *thermal_zone_device_register(char *, int, void *,
> - const struct thermal_zone_device_ops *, int tc1, int tc2,
> - int passive_freq, int polling_freq);
> +struct thermal_zone_device *thermal_zone_device_register(char *, int, int,
> + void *, const struct thermal_zone_device_ops *, int tc1,
> + int tc2, int passive_freq, int polling_freq);
> void thermal_zone_device_unregister(struct thermal_zone_device *);
>
> int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
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