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thermal: add uevent trigger for virtual sensor

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Because thermal-hal thermal throttling processing deponds
on the thermal uevent. So we need to add uevent thermal
trigger for virtual sensor. To avoid event storm, the uevent
only generated when the temperature is higher than threshold
and the change of temperature is by 1C.
Need dts element definition:
"mmi,uevent-temp-threshold" - the uevent trigger threshold
"mmi,need-uevent-sensors" - the sensor list that need uevent

Change-Id: Ifc0e15a57716540d39e696d711e9016fd4a850db
Reviewed-on: https://gerrit.mot.com/2728837
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Lu Chai <chailu1@motorola.com>
Reviewed-by: Huosheng Liao <liaohs@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
weiweij 2023-09-02 14:21:45 +08:00 • committed by Wei Wei
commit 7e9fba0dd5
1 changed files with 90 additions and 0 deletions
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90
drivers/misc/mmi_sys_temp/mmi_sys_temp.c
View file

@ -32,18 +32,25 @@
#define TEMP_NODE_SENSOR_NAMES "mmi,temperature-names"
#define SENSOR_LISTENER_NAMES "mmi,sensor-listener-names"
#define NEED_UEVENT_SENSOR_NAMES "mmi,need-uevent-sensors"
#define UEVENT_TEMP_THRESHOLD "mmi,uevent-temp-threshold"
#define DEFAULT_UEVENT_TEMP_THRESHOLD 40000
#define DEFAULT_TEMPERATURE 0
struct mmi_sys_temp_sensor {
struct thermal_zone_device *tz_dev;
const char *name;
int temp;
bool need_uevent;
int pre_temp;
};
struct mmi_sys_temp_dev {
struct platform_device *pdev;
int num_sensors;
int num_sensors_listener;
int uevent_temp_threshold;
struct mmi_sys_temp_sensor *sensor;
struct mmi_sys_temp_sensor *sensor_listener;
struct notifier_block psy_nb;
@ -52,6 +59,80 @@ struct mmi_sys_temp_dev {
static struct mmi_sys_temp_dev *sys_temp_dev;
static int uevent_generate(struct mmi_sys_temp_dev *data, int index)
{
struct kobj_uevent_env *env;
int ret;
if ((!data->sensor[index].need_uevent) ||
(data->sensor[index].temp < data->uevent_temp_threshold))
return 0;
//compare unit C
if ((data->sensor[index].temp / 1000) == (data->sensor[index].pre_temp / 1000))
return 0;
env = kzalloc(sizeof(*env), GFP_KERNEL);
if (!env) {
dev_err(&data->pdev->dev, "%s: alloc uevent error\n", __func__);
return -1;
}
data->sensor[index].pre_temp = data->sensor[index].temp;
add_uevent_var(env, "NAME=%s", data->sensor[index].name);
add_uevent_var(env, "TEMP=%d", data->sensor[index].temp);
add_uevent_var(env, "TRIP=%d", 0);
ret = kobject_uevent_env(&data->sensor[index].tz_dev->device.kobj, KOBJ_CHANGE, env->envp);
kfree(env);
dev_info(&data->pdev->dev, "trigger uevent index %i, temp %d pre_temp %d",
index, data->sensor[index].temp, data->sensor[index].pre_temp);
return ret;
}
static int uevent_parse_dt(struct mmi_sys_temp_dev *data, struct device_node *node, int num_sensors)
{
const char* name;
int num_need_uevent_sensors, i;
int ret = 0;
num_need_uevent_sensors = of_property_count_strings(node, NEED_UEVENT_SENSOR_NAMES);
if (num_need_uevent_sensors <= 0) {
dev_info(&data->pdev->dev, "No sensor need uevent\n");
return ret;
}
if (of_property_read_u32(node, UEVENT_TEMP_THRESHOLD, &data->uevent_temp_threshold))
data->uevent_temp_threshold = DEFAULT_UEVENT_TEMP_THRESHOLD;
for (i=0; i<num_need_uevent_sensors; i++) {
int n;
ret = of_property_read_string_index(node,
NEED_UEVENT_SENSOR_NAMES, i,
&name);
if (ret) {
dev_err(&data->pdev->dev, "Unable to read of_prop string of uevent sensors\n");
break;
}
dev_info(&data->pdev->dev, "%s need uevent, thresh %d\n", name, data->uevent_temp_threshold);
for(n=0; n<num_sensors; n++) {
if (strstr(data->sensor[n].name, name)) {
dev_info(&data->pdev->dev, "%s uevent flag match!\n", name);
data->sensor[n].need_uevent = true;
break;
}
}
}
return ret;
}
static int mmi_sys_temp_ioctl_open(struct inode *node, struct file *file)
{
return 0;
@ -96,6 +177,9 @@ static long mmi_sys_temp_ioctl(struct file *file, unsigned int cmd,
MMI_SYS_TEMP_NAME_LENGTH)) {
sys_temp_dev->sensor[i].temp =
request.temperature;
/*generate sensor uevent*/
uevent_generate(sys_temp_dev, i);
break;
}
}
@ -168,6 +252,9 @@ static void psy_changed_work_func(struct work_struct *work)
thermal_zone_get_temp(sys_temp_dev->sensor_listener[i].tz_dev,
&sys_temp_dev->sensor_listener[i].temp);
/*generate sensor uevent*/
uevent_generate(sys_temp_dev, i);
} else {
dev_err(&sys_temp_dev->pdev->dev,
"Invalid thermal zone\n");
@ -277,6 +364,9 @@ static int mmi_sys_temp_probe(struct platform_device *pdev)
num_registered = i + 1;
}
/*uevent parameter process*/
uevent_parse_dt(sys_temp_dev, node, num_sensors);
platform_set_drvdata(pdev, sys_temp_dev);
ret = misc_register(&mmi_sys_temp_misc);