Hi Rui,
On Thu, 10 Apr 2008 16:16:00 +0800, Zhang, Rui wrote:
>
> Add hwmon sys I/F for generic thermal driver.
>
> Note: we have one hwmon class device for EACH TYPE of the thermal zone device.
>
> Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
> ---
> drivers/thermal/thermal.c | 164 ++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/thermal.h | 24 ++++++
> 2 files changed, 188 insertions(+)
Much better than the previous version but there are a few problems left:
>
> Index: linux-2.6/drivers/thermal/thermal.c
> ===================================================================
> --- linux-2.6.orig/drivers/thermal/thermal.c
> +++ linux-2.6/drivers/thermal/thermal.c
> @@ -291,6 +291,165 @@ thermal_cooling_device_trip_point_show(s
>
> /* Device management */
>
> +#if defined(CONFIG_HWMON) || \
> + (defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
> +/* hwmon sys I/F */
> +#include <linux/hwmon.h>
> +static LIST_HEAD(thermal_hwmon_list);
> +
> +static ssize_t
> +name_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + struct thermal_hwmon_device *hwmon = dev->driver_data;
> + return sprintf(buf, "%s\n", hwmon->type);
> +}
> +static DEVICE_ATTR(name, 0444, name_show, NULL);
> +
> +static ssize_t
> +temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + struct thermal_hwmon_attr *hwmon_attr
> + = container_of(attr, struct thermal_hwmon_attr, attr);
> + struct thermal_zone_device *tz
> + = container_of(hwmon_attr, struct thermal_zone_device,
> + temp_input);
> +
> + return tz->ops->get_temp(tz, buf);
> +}
> +
> +static ssize_t
> +temp_crit_show(struct device *dev, struct device_attribute *attr,
> + char *buf)
> +{
> + struct thermal_hwmon_attr *hwmon_attr
> + = container_of(attr, struct thermal_hwmon_attr, attr);
> + struct thermal_zone_device *tz
> + = container_of(hwmon_attr, struct thermal_zone_device,
> + temp_crit);
> +
> + return tz->ops->get_trip_temp(tz, 0, buf);
> +}
> +
> +
> +static int
> +thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
> +{
> + struct thermal_hwmon_device *hwmon;
> + int new_hwmon_device = 0;
> + int result;
> +
> + mutex_lock(&thermal_list_lock);
> + list_for_each_entry(hwmon, &thermal_hwmon_list, node)
> + if (!strcmp(hwmon->type, tz->type)) {
> + new_hwmon_device = 1;
> + mutex_unlock(&thermal_list_lock);
> + goto register_sys_interface;
> + }
> + mutex_unlock(&thermal_list_lock);
I'm confused. new_hwmon_device is set to 1 when you do NOT create a new
hwmon device, and to 0 when you DO create a new hwmon device? Wouldn't
it make way more sense the other way around?
> +
> + hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
> + if (!hwmon)
> + return -ENOMEM;
> +
> + INIT_LIST_HEAD(&hwmon->tz_list);
> + strncpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
strlcpy please. strncpy is broken by design and should never be used.
> + hwmon->device = hwmon_device_register(NULL);
> + if (IS_ERR(hwmon->device)) {
> + result = -EINVAL;
Better return the actual error code: PTR_ERR(hwmon->device).
> + goto free_mem;
> + }
> + hwmon->device->driver_data = hwmon;
> + result = device_create_file(hwmon->device, &dev_attr_name);
> + if (result)
> + goto unregister_hwmon_device;
> +
> + register_sys_interface:
> + tz->hwmon = hwmon;
> + hwmon->count++;
> +
> + snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
> + "temp%d_input", hwmon->count);
> + tz->temp_input.attr.attr.name = tz->temp_input.name;
> + tz->temp_input.attr.attr.mode = 0444;
> + tz->temp_input.attr.show = temp_input_show;
> + result = device_create_file(hwmon->device, &tz->temp_input.attr);
> + if (result)
> + goto unregister_hwmon_device;
> +
> + if (tz->ops->get_crit_temp) {
> + unsigned long temperature;
> + if (!tz->ops->get_crit_temp(tz, &temperature)) {
> + snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
> + "temp%d_crit", hwmon->count);
> + tz->temp_crit.attr.attr.name = tz->temp_crit.name;
> + tz->temp_crit.attr.attr.mode = 0444;
> + tz->temp_crit.attr.show = temp_crit_show;
> + result = device_create_file(hwmon->device,
> + &tz->temp_crit.attr);
> + if (result)
> + goto unregister_hwmon_device;
> + }
> + }
> +
> + mutex_lock(&thermal_list_lock);
> + if (!new_hwmon_device)
> + list_add_tail(&hwmon->node, &thermal_hwmon_list);
> + list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
> + mutex_unlock(&thermal_list_lock);
> +
> + return 0;
> +
> + unregister_hwmon_device:
> + device_remove_file(hwmon->device, &tz->temp_crit.attr);
> + device_remove_file(hwmon->device, &tz->temp_input.attr);
> + if (!new_hwmon_device) {
> + device_remove_file(hwmon->device, &dev_attr_name);
> + hwmon_device_unregister(hwmon->device);
> + }
> + free_mem:
> + kfree(hwmon);
This kfree should be conditioned by the value of new_hwmon_device.
> +
> + return result;
> +}
> +
> +static void
> +thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
> +{
> + struct thermal_hwmon_device *hwmon = tz->hwmon;
> +
> + tz->hwmon = NULL;
> + device_remove_file(hwmon->device, &tz->temp_input.attr);
> + device_remove_file(hwmon->device, &tz->temp_crit.attr);
> +
> + mutex_lock(&thermal_list_lock);
> + list_del(&tz->hwmon_node);
> + if (!list_empty(&hwmon->tz_list)) {
> + mutex_unlock(&thermal_list_lock);
> + return;
> + }
> + list_del(&hwmon->node);
> + mutex_unlock(&thermal_list_lock);
> +
> + device_remove_file(hwmon->device, &dev_attr_name);
> + hwmon_device_unregister(hwmon->device);
> + kfree(hwmon);
> + return;
Void functions need no return.
> +}
> +#else
> +static int
> +thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
> +{
> + return 0;
> +}
> +
> +static void
> +thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
> +{
> + return;
Idem.
> +}
> +#endif
> +
> +
> /**
> * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
> * @tz: thermal zone device
> @@ -638,6 +797,10 @@ struct thermal_zone_device *thermal_zone
> goto unregister;
> }
>
> + result = thermal_add_hwmon_sysfs(tz);
> + if (result)
> + goto unregister;
> +
> mutex_lock(&thermal_list_lock);
> list_add_tail(&tz->node, &thermal_tz_list);
> if (ops->bind)
> @@ -696,6 +859,7 @@ void thermal_zone_device_unregister(stru
> for (count = 0; count < tz->trips; count++)
> TRIP_POINT_ATTR_REMOVE(&tz->device, count);
>
> + thermal_remove_hwmon_sysfs(tz);
> release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
> idr_destroy(&tz->idr);
> mutex_destroy(&tz->lock);
> Index: linux-2.6/include/linux/thermal.h
> ===================================================================
> --- linux-2.6.orig/include/linux/thermal.h
> +++ linux-2.6/include/linux/thermal.h
> @@ -66,6 +66,23 @@ struct thermal_cooling_device {
> ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
> #define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
>
> +#if defined(CONFIG_HWMON) || \
> + (defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
> +/* thermal zone devices with the same type share one hwmon device */
> +struct thermal_hwmon_device {
> + char type[THERMAL_NAME_LENGTH];
> + struct device *device;
> + int count;
> + struct list_head tz_list;
> + struct list_head node;
> +};
> +
> +struct thermal_hwmon_attr {
> + struct device_attribute attr;
> + char name[16];
> +};
> +#endif
> +
> struct thermal_zone_device {
> int id;
> char type[THERMAL_NAME_LENGTH];
> @@ -77,6 +94,13 @@ struct thermal_zone_device {
> struct idr idr;
> struct mutex lock; /* protect cooling devices list */
> struct list_head node;
> +#if defined(CONFIG_HWMON) || \
> + (defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
> + struct list_head hwmon_node;
> + struct thermal_hwmon_device *hwmon;
> + struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
> + struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
> +#endif
> };
>
> struct thermal_zone_device *thermal_zone_device_register(char *, int, void *,
>
>
--
Jean Delvare
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